Broadcom BCM5722 - Table 563: Auxiliary Mode 3 Register (Shadow Register 29 D, 1 Dh); Table 564: Current Receive FIFO Size; Table 565: Auxiliary Status 4 Register (Shadow Register 30 D, 1 Eh)

Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R Transceiver Registers (BCM5906/BCM5906M) Page 512
Auxiliary Mode 3 Register (Shadow Register)
FIFO Size Select [3:0]
The PHY indicates the current selection of receive FIFO size using bit 3 through 0 as shown in Table 30. The size can also
be determined by bit Extended FIFO Enable (register 10h, bit 2) and bit Jumbo Packet Enable (register 1Bh, bit 9) for
backward compatibility with the 0.35-mm products.
Auxiliary Status 4 Register (Shadow Register)
Packet Length Counter [15:0]
The PHY shows the number of bytes in the last packet received. This is valid only when a valid link is established.
Table 563: Auxiliary Mode 3 Register (Shadow Register 29d, 1Dh)
BIt Name R/W Description Default
15:4 Reserved - - 000h
3:0 FIFO Size Select[3:0] R/W Currently selected receive FIFO size 0100
R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear after read
operation. Use default values of reserved bit(s) when writing to reserved bit(s).
Table 564: Current Receive FIFO Size
FIFO Size Select[3:0] Receive FIFO size in use (Number of Bits)
0000 12
0001 16
0010 20
0011 24
0100 28
0101 32
0110 36
0111 40
1000 44
1001 48
1010 52
1011 56
1100 60
1101 64
Table 565: Auxiliary Status 4 Register (Shadow Register 30d, 1Eh)
BIt Name R/W Description Default
15:0 Packet Length Counter[15:0] R/O Number of bytes in the last received packet 0000h