參數(shù)資料
型號(hào): CL-PD6722
廠商: Cirrus Logic, Inc.
英文描述: ISA-TOOPC-CARD HOST ADAPTERS
中文描述: ISA的TOOPC卡主機(jī)適配器
文件頁數(shù): 60/128頁
文件大?。?/td> 1591K
代理商: CL-PD6722
PRELIMINARY DATA SHEET v3.1
CL-PD6710/’22
ISA–to–PC-Card Host Adapters
May 1997
60
EXTENSION REGISTERS
9.2
FIFO Control
Bit 7 — Empty Write FIFO
This bit controls FIFO operation and reports FIFO status. When this bit is written to ‘1’, all data in
the FIFO is lost. During read operations when this bit is ‘1’, the FIFO is empty. During read oper-
ations when this bit is ‘0’, data is still in the FIFO. This bit is used to ensure the FIFO is empty be-
fore changing timing registers.
FIFO contents will be lost whenever any of the following occur:
G
PWRGOOD pin (see
page 13
) is ‘0’.
G
The card is removed.
G
V
CC
Power bit (see
page 41
) is programmed to ‘0’.
a
Because a write will flush the FIFO, these scratchpad bits should be used only when card activity is guaranteed not to occur.
Register Name:
FIFO Control
Index:
17h
Bit
7
Register Per: socket
Register Compatibility Type: ext.
Bit
1
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
0
Empty Write
FIFO
Scratchpad Bits
a
RW
RW:0000000
Value
I/O Read
I/O Write
0
1
FIFO not empty
FIFO empty
No operation occurs; default on reset
Flush the FIFO
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