W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 55

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
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The device build-in a 16-byte data fifo to accelerate the transfer rate when using "Fast Standard
Mode" or "ECP mode".
The Dfifo may be 1-byte or 4-byte accessed by CPU using "PWord" basis.
Command Register (CMD)
Port address : 0xf0000374
Bits 0-7 Pended Command Code
Whenever a command code is written by CPU, a "command trasfer" will be induced immediately
during "ECP forward transfering".
If CMD contains a command code not been transfered yet, a "command pended" status (CMDtrue)
is echoed in DSR[7]. "Reset device" or "CPU read CMD" or the pended command code is finished
transfering, the CMDtrue will also be cleared.
Time Out Register (TOR)
Port address : 0xf0000375
Bits 0
TOUTen
16
24
0
0
Time Out Counter enable
17
25
1
1
18
26
2
2
Pended Command Code
Read/write
Read/write
Dfifo LSB byte
19
27
3
3
TOUTcmp
20
28
4
4
Power-on Default : ---
Power-on Default : ---
21
29
5
5
22
30
6
6
23
31
7
7
W90220F
Version 0.84