dingusppc/zdocs/bmac.md
joevt cd122ce263 Open Firmware is two words
Not OpenFirmware.
Also fixed a spelling mistake and removed some extra spaces.
2022-08-22 16:47:38 -07:00

1.8 KiB

The BMac is an Ethernet controller featured in G3 and early G4 Macs. As described by a Linux contributor, this controller "appears to have some parts in common with the Sun "Happy Meal" (HME) controller".

The max frame size is 0x5EE bytes.

It resides on 0xF3011000, with Writing DMA on 0xF3008200 and Reading DMA on 0xF3008300.

Register Map

Register Name Offset
XIFC 0x000
TXFIFOCSR 0x100
TXTH 0x110
RXFIFOCSR 0x120
MEMADD 0x130
XCVRIF 0x160
CHIPID 0x170
MIFCSR 0x180
SROMCSR 0x190
TXPNTR 0x1A0
RXPNTR 0x1B0
STATUS 0x200
INTDISABLE 0x210
TXRST 0x420
TXCFG 0x430
IPG1 0x440
IPG2 0x450
ALIMIT 0x460
SLOT 0x470
PALEN 0x480
PAPAT 0x490
TXSFD 0x4A0
JAM 0x4B0
TXMAX 0x4C0
TXMIN 0x4D0
PAREG 0x4E0
DCNT 0x4F0
NCCNT 0x500
NTCNT 0x510
EXCNT 0x520
LTCNT 0x530
RSEED 0x540
TXSM 0x550
RXRST 0x620
RXRST 0x620
RXCFG 0x630
RXMAX 0x640
RXMIN 0x650
MADD2 0x660
MADD1 0x670
MADD0 0x680
FRCNT 0x690
LECNT 0x6A0
AECNT 0x6B0
FECNT 0x6C0
RXSM 0x6D0
RXCV 0x6E0
HASH3 0x700
HASH2 0x710
HASH1 0x720
HASH0 0x730
AFR2 0x740
AFR1 0x750
AFR0 0x760
AFCR 0x770