w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 71

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
7.4.3
Reading this register returns E0H. Writing a value selects Register Set.
Refault Value
REG.
SSR
Reg3 - Sets Select Register (SSR)
DMATHL
0
1
ALOOP - All Mode Loopback
A write to 1 will enable loopback in all modes.
D_CHSW - DMA TX/RX Channel Swap
If only one DMA channel operates in MIR/FIR mode, then the DMA channel can be
swapped.
A write to 1 will enable output data when ALOOP=1.
DMATHL - DMA Threshold Level
Set DMA threshold level as shown in the following table.
DMA_F - DMA Fairness
ADV_SL - Advanced Mode Select
A write to 1 selects advanced mode.
BIT 7
SSR7
1
DMA_F
0
1
BIT 6
SSR6
D_CHSW
1
0
1
16-BYTE
13
23
SSR5
BIT 5
TX FIFO THRESHOLD
1
DMA request (DREQ) is forced inactive after 10.5us
- 63 -
SSR4
BIT 4
DMA Channel Selected
0
Receiver (Default)
W83977ATF/W83977ATG
Transmitter
No effect DMA request.
Function Description
32-BYTE
BIT 3
SSR3
0
13
7
Publication Release Date: May 2006
BIT 2
SSR2
0
RX FIFO THRESHOLD
SRR1
BIT 1
(16/32-BYTE)
0
10
4
Revision 0.6
SRR0
BIT 0
0