W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 100

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

Bit 2: Read/Write
Bit 1: Read only
Bit 0: Read only
8.3.11
Notes:
1. These registers are available in all modes.
2. All FIFOs use one common 16-byte FIFO.
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
1
0
0
1
0
1
Bit Map of ECP Port Registers
Parallel Port Data FIFO
Addr/RLE
ECP Data FIFO
Test FIFO
compress
nBusy
PD7
D7
1
0
Disables DMA and all of the service interrupts.
Enables one of the following cases of interrupts. When one of the service interrupts
has occurred, the serviceIntr bit is set to a 1 by hardware. This bit must be reset to
0 to re-enable the interrupts. Writing a 1 to this bit will not cause an interrupt.
(a) dmaEn = 1: During DMA this bit is set to a 1 when terminal count is reached.
(b) dmaEn = 0 direction = 0: This bit is set to 1 whenever there are writeIntr
Threshold or more bytes free in the FIFO.
(c) dmaEn = 0 direction = 1: This bit is set to 1 whenever there are readIntr
Threshold or more valid bytes to be read from the FIFO.
The FIFO has at least 1 free byte.
The FIFO cannot accept another byte or the FIFO is completely full.
The FIFO contains at least 1 byte of data.
The FIFO is completely empty.
Address or RLE field
intrValue
MODE
nAck
PD6
D6
1
0
Directio
PError
PD5
D5
0
1
nErrIntrEn
ackIntEn
Select
PD4
D4
1
1
-92
SelectIn
dmaEn
nFault
PD3
D3
0
1
serviceIntr
PD2
nInit
D2
1
0
1
autofd
PD1
D1
full
1
0
1
strobe
empty
PD0
D0
1
0
1
NOTE
2
1
1
2
2
2