2020-03-07 22:40:46 +00:00
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".
2022-08-22 06:49:18 +00:00
2020-03-07 22:40:46 +00:00
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 |
