Rainbow Electronics W90N740 - Manual (Page 103)

W90N740
Publication Release Date: November 26, 2004
- 99 - Revision A4
FIFO Threshold Adjustment Register (FIFOTHD_0, FIFOTHD_1)
Register Address R/W Description Reset Value
FIFOTHD_0 0xFFF0.30B0 R/W FIFO Threshold Adjustment Register 0x0000.0101
FIFOTHD_1 0xFFF0.38B0 R/W FIFO Threshold Adjustment Register 0x0000.0101
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved Blength Reserved SWR
15 14 13 12 11 10 9 8
Reserved TxTHD
7 6 5 4 3 2 1 0
Reserved RxTHD
Blength [21:20]: DMA burst length
Default value: 0h
Value setting:
00b: 4 beats
01b: 8 beats
10b: 16 beats
11b: 16 beats
SWR [16]: software reset
Default value: 0h
Software reset. After a reset is complete, the MAC controller will clear the SWR reset bit.
TxTHD [9:8]: Transmit FIFO Lower threshold Register
Default value: 1h
Value setting:
00b: forbidden
01b: 32 bytes (i.e. high threshold 64 bytes)
10b: 64 bytes (i.e. high threshold 128 bytes)
11b: 96 bytes (i.e. high threshold 192 bytes)
This value controls the transmit FIFO low threshold. If transmitting packet number is less than the