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supermario/base/SuperMarioProj.1994-02-09/DeclData/DeclNet/Sonic/SonicEqu.a
Elliot Nunn 2e16381318 Bring in sources, and document
2019-06-29 23:17:50 +08:00

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;
; File: SonicEqu.a
;
; Contains: Sonic-specific equates
;
; Written by: Sean Findley
;
; Copyright: © 1990, 1992 by Apple Computer, Inc., all rights reserved.
;
; This file is used in these builds: Mac32
;
; Change History (most recent first):
;
; <1> 10/6/92 GDW New location for ROMLink tool.
; <1> 6/12/92 RLM first checked in
; <P2> 02/07/92 jmp (jmp,H2/BG/SJF,Z4) Rolled in SMOVE macro def and SonicAddress
; def.
; <1> 2/4/92 mal first checked in
; ———————————————————————————————————————————————————————————————————————————————————————
; Pre-Pandora ROM comments begin here.
; ———————————————————————————————————————————————————————————————————————————————————————
; <3> 2/26/91 JK Added extended Motorola mode equates.
; <2> 1/30/91 JK Added code review changes.
; <1> 12/14/90 JK Added to build
;
; To Do:
;
; SonicEqu.a - Equates for SONIC
; written by Sean J. Findley Jan. 1990
; Copyright (c) 1990 Apple Computer, Inc.
MACRO
CtlRegPad
IF CTLPAD THEN
ORG *+2
ENDIF
ENDM
MACRO ; <Z4> thru next <Z4>
SMOVE &src,&dest
IF SONIC32 THEN
MOVE.L &src,&dest
ELSE
MOVE.W &src,&dest
ENDIF
ENDM ; <Z4>
;•••••••••••••••• SONIC Registers
SONICRegs RECORD 0
IF SONIC32 THEN
Command DS.L 1 ; (CR) SONIC control
Data_Config DS.L 1 ; (DCR) packet configuration
Recv_Control DS.L 1 ; (RCR) pkt reception control
Trans_Control DS.L 1 ; (TCR) Transmission control
Int_Mask DS.L 1 ; (IMR) interrupt mask
Int_Status DS.L 1 ; (ISR) interrupts status bits
Upper_TDA DS.L 1 ; (UTDA) upper 16 bits of TDA address
Current_TDA DS.L 1 ; (CTDA) 16 bit ptr to current TDA
Trans_PktSize DS.L 1 ; (TPS) total size of outbound pkt
Trans_FragCount DS.L 1 ; (TFC) transmit fragment count
Trans_PktStart0 DS.L 1 ; (TSA0) lower 16 bit of pkt addr
Trans_PktStart1 DS.L 1 ; (TSA1) upper "
Trans_FragSize DS.L 1 ; (TFS) current fragment size
Upper_RDA DS.L 1 ; (URDA) upper 16 bits of RDA address
Current_RDA DS.L 1 ; (CRDA) 16 bit ptr to current RDA
Recv_RBA0 DS.L 1 ; (CRBA0) lower 16 bit receive addr in RBA
Recv_RBA1 DS.L 1 ; (CRBA1) upper 16 bit recive addr in RBA
Buff_Cnt0 DS.L 1 ; (RBWC0) lower 16 bit of word count in RBA
Buff_Cnt1 DS.L 1 ; (RBWC1) upper "
End_Buff DS.L 1 ; (EOBC) end of buffer word count
Upper_RRA DS.L 1 ; (URRA) upper 16 bits of RRA address
RRA_Start DS.L 1 ; (RSA) 16 bit ptr to RRA
RRA_End DS.L 1 ; (REA) 16 bit ptr to end of RRA
RRA_Read DS.L 1 ; (RRP) where SONIC gets next read resource
RRA_Write DS.L 1 ; (RWP) where host puts new read resources
TRBA0 DS.L 1 ; (TRBA0) used by SONIC
TRBA1 DS.L 1 ; (TRBA1) "
TBWC0 DS.L 1 ; (TBWC0) "
TBWC1 DS.L 1 ; (TBWC1) "
ADDR0 DS.L 1 ; (ADDR0) "
ADDR1 DS.L 1 ; (ADDR1) "
LLFA DS.L 1 ; (LLFA) "
TTDA DS.L 1 ; (TTDA) "
CAM_EntryPtr DS.L 1 ; (CEP) points to CAM cell
CAM_Port2 DS.L 1 ; (CAP2) selects upper 16 bits of CAM cell
CAM_Port1 DS.L 1 ; (CAP1) selects middle 16 bits of CAM cell
CAM_Port0 DS.L 1 ; (CAP0) selects lower 16 bits of CAM cell
CAM_Enable DS.L 1 ; (CE) CAM enable register turns cells on/off
CAM_DescPtr DS.L 1 ; (CDP) 16 bit ptr to current CAM descriptor
CAM_Count DS.L 1 ; (CDC) count of CAM descriptors
Silicon_Rev DS.L 1 ; (SR) rev info on SONIC chip
Timer0 DS.L 1 ; (WT0) lower 16 bits of SONCIC timer
Timer1 DS.L 1 ; (WT1) upper 16 "
Recv_SeqCnt DS.L 1 ; (RSC) receive sequence counter
CRC_Err DS.L 1 ; (CRCT) CRC error count
FAE_Err DS.L 1 ; (FAET) frame alignment error count
MissedPkt_Err DS.L 1 ; (MPT) missed packet error count
MDT DS.L 1 ; (MDT) max. deferral timer
RTC DS.L 1 ; (RTC) receive test control
TTC DS.L 1 ; (TTC) transmit test control
DTC DS.L 1 ; (DTC) DMA test control
CC0 DS.L 1 ; (CC0) CAM comparison 0
CC1 DS.L 1 ; (CC1) CAM comparison 1
CC2 DS.L 1 ; (CC2) CAM comparison 2
CM DS.L 1 ; (CM) CAM match
res1 DS.L 2 ; reserved by National Semiconductor
RBC DS.L 1 ; (RBC) receiver byte count
res2 DS.L 1 ; reserved by National Semiconductor
TBO DS.L 1 ; (TBO) transmit backoff counter
TRC DS.L 1 ; (TRC) transmit random counter
TBM DS.L 1 ; (TBM) transmit backoff mask
res3 DS.L 1 ; reserved by National Semiconductor
Data_Config2 DS.L 1 ; extended data configiguration
ELSE
Command DS.W 1 ; (CR) SONIC control
CtlRegPad
Data_Config DS.W 1 ; (DCR) packet configuration
CtlRegPad
Recv_Control DS.W 1 ; (RCR) pkt reception control
CtlRegPad
Trans_Control DS.W 1 ; (TCR) Transmission control
CtlRegPad
Int_Mask DS.W 1 ; (IMR) interrupt mask
CtlRegPad
Int_Status DS.W 1 ; (ISR) interrupts status bits
CtlRegPad
Upper_TDA DS.W 1 ; (UTDA) upper 16 bits of TDA address
CtlRegPad
Current_TDA DS.W 1 ; (CTDA) 16 bit ptr to current TDA
CtlRegPad
Trans_PktSize DS.W 1 ; (TPS) total size of outbound pkt
CtlRegPad
Trans_FragCount DS.W 1 ; (TFC) transmit fragment count
CtlRegPad
Trans_PktStart0 DS.W 1 ; (TSA0) lower 16 bit of pkt addr
CtlRegPad
Trans_PktStart1 DS.W 1 ; (TSA1) upper "
CtlRegPad
Trans_FragSize DS.W 1 ; (TFS) current fragment size
CtlRegPad
Upper_RDA DS.W 1 ; (URDA) upper 16 bits of RDA address
CtlRegPad
Current_RDA DS.W 1 ; (CRDA) 16 bit ptr to current RDA
CtlRegPad
Recv_RBA0 DS.W 1 ; (CRBA0) lower 16 bit receive addr in RBA
CtlRegPad
Recv_RBA1 DS.W 1 ; (CRBA1) upper 16 bit recive addr in RBA
CtlRegPad
Buff_Cnt0 DS.W 1 ; (RBWC0) lower 16 bit of word count in RBA
CtlRegPad
Buff_Cnt1 DS.W 1 ; (RBWC1) upper "
CtlRegPad
End_Buff DS.W 1 ; (EOBC) end of buffer word count
CtlRegPad
Upper_RRA DS.W 1 ; (URRA) upper 16 bits of RRA address
CtlRegPad
RRA_Start DS.W 1 ; (RSA) 16 bit ptr to RRA
CtlRegPad
RRA_End DS.W 1 ; (REA) 16 bit ptr to end of RRA
CtlRegPad
RRA_Read DS.W 1 ; (RRP) where SONIC gets next read resource
CtlRegPad
RRA_Write DS.W 1 ; (RWP) where host puts new read resources
CtlRegPad
TRBA0 DS.W 1 ; (TRBA0) used by SONIC
CtlRegPad
TRBA1 DS.W 1 ; (TRBA1) "
CtlRegPad
TBWC0 DS.W 1 ; (TBWC0) "
CtlRegPad
TBWC1 DS.W 1 ; (TBWC1) "
CtlRegPad
ADDR0 DS.W 1 ; (ADDR0) "
CtlRegPad
ADDR1 DS.W 1 ; (ADDR1) "
CtlRegPad
LLFA DS.W 1 ; (LLFA) "
CtlRegPad
TTDA DS.W 1 ; (TTDA) "
CtlRegPad
CAM_EntryPtr DS.W 1 ; (CEP) points to CAM cell
CtlRegPad
CAM_Port2 DS.W 1 ; (CAP2) selects upper 16 bits of CAM cell
CtlRegPad
CAM_Port1 DS.W 1 ; (CAP1) selects middle 16 bits of CAM cell
CtlRegPad
CAM_Port0 DS.W 1 ; (CAP0) selects lower 16 bits of CAM cell
CtlRegPad
CAM_Enable DS.W 1 ; (CE) CAM enable register turns cells on/off
CtlRegPad
CAM_DescPtr DS.W 1 ; (CDP) 16 bit ptr to current CAM descriptor
CtlRegPad
CAM_Count DS.W 1 ; (CDC) count of CAM descriptors
CtlRegPad
Silicon_Rev DS.W 1 ; (SR) rev info on SONIC chip
CtlRegPad
Timer0 DS.W 1 ; (WT0) lower 16 bits of SONCIC timer
CtlRegPad
Timer1 DS.W 1 ; (WT1) upper 16 "
CtlRegPad
Recv_SeqCnt DS.W 1 ; (RSC) receive sequence counter
CtlRegPad
CRC_Err DS.W 1 ; (CRCT) CRC error count
CtlRegPad
FAE_Err DS.W 1 ; (FAET) frame alignment error count
CtlRegPad
MissedPkt_Err DS.W 1 ; (MPT) missed packet error count
CtlRegPad
MDT DS.W 1 ; (MDT) max. deferral timer
CtlRegPad
RTC DS.W 1 ; (RTC) receive test control
CtlRegPad
TTC DS.W 1 ; (TTC) transmit test control
CtlRegPad
DTC DS.W 1 ; (DTC) DMA test control
CtlRegPad
CC0 DS.W 1 ; (CC0) CAM comparison 0
CtlRegPad
CC1 DS.W 1 ; (CC1) CAM comparison 1
CtlRegPad
CC2 DS.W 1 ; (CC2) CAM comparison 2
CtlRegPad
CM DS.W 1 ; (CM) CAM match
CtlRegPad
res1 DS.W 2 ; reserved by National Semiconductor
CtlRegPad
RBC DS.W 1 ; (RBC) receiver byte count
CtlRegPad
res2 DS.W 1 ; reserved by National Semiconductor
CtlRegPad
TBO DS.W 1 ; (TBO) transmit backoff counter
CtlRegPad
TRC DS.W 1 ; (TRC) transmit random counter
CtlRegPad
TBM DS.W 1 ; (TBM) transmit backoff mask
CtlRegPad
res3 DS.W 1 ; reserved by National Semiconductor
CtlRegPad
Data_Config2 DS.W 1 ; extended data configiguration
ENDIF
ENDR
;•••••••••••••••• Content Addressable Memory (CAM) Descriptor Area CDA
CAMDesc RECORD 0
IF SONIC32 THEN
Entry_ptr DS.L 1 ; base zero index to CAM cell
Port2 DS.L 1 ; lower 16 bits in cell
Port1 DS.L 1 ; middle 16 bits in cell
Port0 DS.L 1 ; upper 16 bits in cell
enable DS.L 1 ; CAM cell enable mask
ELSE
Entry_ptr DS.W 1 ; base zero index to CAM cell
Port2 DS.W 1 ; lower 16 bits in cell
Port1 DS.W 1 ; middle 16 bits in cell
Port0 DS.W 1 ; upper 16 bits in cell
enable DS.W 1 ; CAM cell enable mask
ENDIF
CAMDescSz EQU *
ENDR
;•••••••••••••••• Receive Resource Descriptor Area RRA
RRArec RECORD 0
IF SONIC32 THEN
buff_ptr0 DS.L 1 ; lower 16 bits of RBA address
buff_ptr1 DS.L 1 ; upper 16 bits of RBA address
buff_wc0 DS.L 1 ; lower 16 bits of RBA word count
buff_wc1 DS.L 1 ; upper 16 bits of RBA word count
ELSE
buff_ptr0 DS.W 1 ; lower 16 bits of RBA address
buff_ptr1 DS.W 1 ; upper 16 bits of RBA address
buff_wc0 DS.W 1 ; lower 16 bits of RBA word count
buff_wc1 DS.W 1 ; upper 16 bits of RBA word count
ENDIF
RRArecSz EQU *
ENDR
;•••••••••••••••• Receive Descriptor Area RDA
Rxpkt RECORD 0
; this link is used to keep rx descriptors on our own list(s) when SONIC is not using them
nextRD DS.L 1 ; internal ptr to next descriptor
isFree DS.B 1 ; = true if desc has been freed
ORG nextRD
IF SONIC32 THEN
status DS.L 1 ; receive status
byte_count DS.L 1 ; size of packet read
pkt_ptr0 DS.L 1 ; lower 16 bits of packet addr. in RBA
pkt_ptr1 DS.L 1 ; upper 16 bits of packet addr. in RBA
seq_no DS.L 1 ; sequence number
link DS.L 1 ; link to other RD
in_use DS.L 1 ; use flag
ELSE
status DS.W 1 ; receive status
byte_count DS.W 1 ; size of packet read
pkt_ptr0 DS.W 1 ; lower 16 bits of packet addr. in RBA
pkt_ptr1 DS.W 1 ; upper 16 bits of packet addr. in RBA
seq_no DS.W 1 ; sequence number
link DS.W 1 ; link to other RD
in_use DS.W 1 ; use flag
ENDIF
RxRDAsize EQU *
ENDR
;•••••••••••••••• Transmit Descriptor Area TDA
Max_Tx_Frags EQU 16 ; maximum fragments supported for a transmit
Txpkt RECORD 0 ; Transmit Descriptor
; this link is used to keep tx descriptors on our own list when SONIC is not using them
nextTD DS.L 1 ; internal ptr to next descriptor
ORG nextTD
IF SONIC32 THEN
status DS.L 1 ; status info written by SONIC
config DS.L 1 ; pre-transmit config data
pkt_size DS.L 1 ; size of packet
frag_count DS.L 1 ; fragment count
frag_start EQU * ; start of individual fragments
; the following 3 fields are repeated 1..frag_count
frag_ptr0 DS.L 1 ; lower 16 bits of address
frag_ptr1 DS.L 1 ; upper "
frag_size DS.L 1 ; fragment size
frag_esize EQU * - frag_start ; size of individual fragments
ORG * + (Max_Tx_Frags-1) * frag_esize
; allocate rest of fragments
link DS.L 1 ; lower 16 bits of next TD (if any)
ELSE
status DS.W 1 ; status info written by SONIC
config DS.W 1 ; pre-transmit config data
pkt_size DS.W 1 ; size of packet
frag_count DS.W 1 ; fragment count
frag_start EQU * ; start of individual fragments
; the following 3 fields are repeated 1..frag_count
frag_ptr0 DS.W 1 ; lower 16 bits of address
frag_ptr1 DS.W 1 ; upper "
frag_size DS.W 1 ; fragment size
frag_esize EQU * - frag_start ; size of individual fragments
ORG * + (Max_Tx_Frags-1) * frag_esize
; allocate rest of fragments
link DS.W 1 ; lower 16 bits of next TD (if any)
ENDIF
TxTDAsize EQU * ; size of a single frame TD
ENDR
;•••••••••••••••• Initialization Parameters
SONICinitParms RECORD 0
SONICbase DS.L 1 ; base address of SONIC registers
IntInstall DS.L 1 ; addr of proc that installs interrupt handler
RECVRtn DS.L 1 ; address of receive routine
RECVPrms DS.L 1 ; parms to pass @ receive
TRANRtn DS.L 1 ; address of xmit complete routine
TRANPrms DS.L 1 ; parms to pass @ xmit complete
MemStart DS.L 1 ; address of memory usage area
MemSize DS.L 1 ; size of memory usage area
NumRxBuffs DS.L 1 ; proposed # of receive buffers
IntDisable DS.L 1 ; proc to disable interrupts
IntEnable DS.L 1 ; proc to reenable interrupts
NetStatArray DS.L 1 ; ptr to network statistics array
DataConfig DS.L 1 ; data configuration value
TransAddr DS.L 1 ; ->proc to translate logical->physical address
ParmSize EQU *
ENDR
;•••••••••••••••• CAM Parameters
CAMparms RECORD 0
SONICPtr DS.L 1 ; SONIC base address <Z4>
EAddr DS.B 6 ; Ethernet address
LoadorClear DS.L 1 ; ≠ 0 if adding CAM entry
ParmSize EQU *
ENDR
;•••••••••••••••• (CR) Command Register Bits
LoadCAM EQU 9 ; load content addressable memory
ReadRRA EQU 8 ; read next read resource descriptor
SoftReset EQU 7 ; do a software reset
StartTimer EQU 5 ; start watchdog timer
StopTimer EQU 4 ; stop "
RxEnable EQU 3 ; receive packets
RxDisable EQU 2 ; stop receiving packets
TxEnable EQU 1 ; transmit packets
TxDisable EQU 0 ; stop transmitting packets
;•••••••••••••••• (RCR) Receive Control/Status Register Bits
RecvErrors EQU 15 ; accept/reject packets with errors
RecvRunts EQU 14 ; accept/reject runt packets
RecvBroadCast EQU 13 ; accept/reject broadcasts
RecvAll EQU 12 ; turn on/off promiscuious mode
RecvMultiCast EQU 11 ; accept/reject multicasts
NoLoopBack EQU $0000 ; mask for no loopback
MACLoopBack EQU $0200 ; mask for MAC loopback
ENDECLoopBack EQU $0400 ; mask for ENDEC loopback
TxRxLoopBack EQU $0600 ; mask for Transceiver loopback
MultiRecd EQU 8 ; set when multicast is received
BroadRecd EQU 7 ; set when broadcast is received
RBAEmpty EQU 6 ; set when out of buffers in RBA
CarrierSense EQU 5 ; set when net busy and CRS is active
CollisionSense EQU 4 ; set when collision occurs if COL active
CRCErr EQU 3 ; set if packet has CRC error
FramAlignErr EQU 2 ; set if frame not aligned
LoopBackRecd EQU 1 ; set when loopback is received
ReceivedOK EQU 0 ; set upon successful packet reception
;•••••••••••••••• (TCR) Transmit Control/Status Register Bits
TxProgInt EQU 15 ; generate a software interrupt
OWCTimer EQU 14 ; "out of window collision" timer control
CRCInhibit EQU 13 ; turn on/off FCS field
ExDeferTimer EQU 12 ; turn on/off excessive defer timer
ExcessDefer EQU 10 ; excessive deferrals detected
DeferredTx EQU 9 ; set when packet is being deferred
NoCRS EQU 8 ; CRS not present during transmission
CRSLost EQU 7 ; bad CRS during transmission
ExcessColl EQU 6 ; > 16 collisions detected
OutWindow EQU 5 ; "out of window" collision detected
PktMonitorBad EQU 3 ; packet monitored as bad
FIFOUnderRun EQU 2 ; Tx FIFO underrun
BCMismatch EQU 1 ; TxPkt_size ≠ sum(TxFrag_size)
TransmitOK EQU 0 ; packet transmitted successfuly
;•••••••••••••••• (DCR) Data Configuration Register Bits
EXBUS EQU 15 ; extended bus mode
LatchBusRetry EQU 13 ; LBR
DConfig_Usr1 EQU 12 ; sets/resets pin USR1
DConfig_Usr0 EQU 11 ; sets/resets pin USR0
SynchTerm EQU 10 ; select sync/async input to DMA
WaitCtl0 EQU $0000 ; 0 bus cycles added to DMA
WaitCtl1 EQU $0040 ; 1 bus cycle added to DMA
WaitCtl2 EQU $0080 ; 2 bus cycles added to DMA
WaitCtl3 EQU $00C0 ; 3 bus cycles added to DMA
DataWidth EQU 5 ; 16/32 bit path width for DMA
BlockMode EQU 4 ; DMA block mode selection
RFT2 EQU $0000 ; 2 word recv FIFO threshold
RFT4 EQU $0004 ; 4 word recv FIFO threshold
RFT8 EQU $0008 ; 8 word recv FIFO threshold
RFT12 EQU $000C ; 12 word recv FIFO threshold
TFT4 EQU $0000 ; 4 word trans FIFO threshold
TFT8 EQU $0001 ; 8 word trans FIFO threshold
TFT12 EQU $0002 ; 12 word trans FIFO threshold
TFT14 EQU $0003 ; 14 word trans FIFO threshold
;•••••••••••••••• (DCR2) Extended Data Configuration Register Bits
EXUSR3 EQU 15 ; extended user bits
EXUSR2 EQU 14
EXUSR1 EQU 13
EXUSR0 EQU 12
;•••••••••••••••• (ISR) Interrupt Status Register Bits
BusRetry EQU 14 ; set when bus needed retry
LostHeartBeat EQU 13 ; set when heartbeat is lost
DoneLoadCAM EQU 12 ; set when load CAM operation is done
GetProgInt EQU 11 ; set when programmable int. occurs
RecdPkt EQU 10 ; set when a packet has been recd.
TransDone EQU 9 ; set when trans is finished
TransError EQU 8 ; set when trans finished with an error
TimerElapsed EQU 7 ; set when timer reaches zero
EmptyRDA EQU 6 ; set when receive descriptors exhausted
EmptyRRA EQU 5 ; set when receive resources exhausted
RBAOverFLow EQU 4 ; set when buffer area is full
CRCRollover EQU 3 ; set when CRC tally has reached $FFFF
FAERollover EQU 2 ; set when FAE tally has reached $FFFF
MPRollover EQU 1 ; set when MP tally has reached $FFFF
RxFIFORollover EQU 0 ; set when Rx FIFO overflows
OurIntsMask EQU (1 << BusRetry) + \
(1 << RecdPkt) + \
(1 << TransDone) + \
(1 << TimerElapsed) + \
(1 << RxFIFORollover) + \
(1 << RBAOverFlow) + \
(1 << EmptyRRA)
;•••••••••••••••• Network Statistics
NetStats RECORD 0 ; network management stats.
TxOK DS.L 1 ; frames transmitted OK
sCollFrame DS.L 1 ; single collision frames
mCollFrame DS.L 1 ; multiple collision frames
CollFrame DS.L 1 ; collision frames
DefTx DS.L 1 ; deferred transmissions
LateColl DS.L 1 ; late collisions
ExcessColl DS.L 1 ; excessive collisions
ExcessDef DS.L 1 ; excessive defferals
InMACTxErr DS.L 1 ; internal MAC transmit errors
RxOK DS.L 1 ; frames received OK
MultiRxOK DS.L 1 ; multicast frames recd OK
BroadRxOK DS.L 1 ; broadcast frames recd OK
FCSerr DS.L 1 ; frame check sequence errors
FAerr DS.L 1 ; frame alignment errors
MPerr DS.L 1 ; missed packet errors
Size EQU *
ENDR
;•••••••••••••••• General Equates
TalliesPerSec EQU 5000000 ; number of timer ticks/second
TxMaxRetries EQU 4 ; max attempts to retry aborted xmits
Max_Tx_Packets EQU 16 ; maximum # of chained Tx packets
Min_Pkt_Size EQU 60 ; minimum packet size
Min_Rx_Buffs EQU 2 ; minimum # of recv descriptors/buffers
Max_Pkt_Size EQU 1518 ; maximum packet size (inc. CRC)
EOL_Bit EQU 0 ; end-of-link bit
Ctl_Mem_Size EQU Txpkt.TxTDAsize*Max_Tx_Packets+ \; up to Max_Tx_Packets chained transmits
RRArec.RRArecSz+ \; 1 RRA descriptor
CAMDesc.CAMDescSz ; 1 CAM descriptor
Min_Mem_Size EQU Ctl_Mem_Size+ \
Max_Pkt_Size*Min_Rx_Buffs+ \; max. size packets
Rxpkt.RxRDAsize*Min_Rx_Buffs; recv. descriptors
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