TABLE 7: "NIBBLE MODE" SIGNAL DESCRIPTIONS S
參數(shù)資料
型號: ST78C36CJ44TR-F
廠商: Exar Corporation
文件頁數(shù): 7/27頁
文件大?。?/td> 0K
描述: IC UART FIFO 16B 44PLCC
標(biāo)準(zhǔn)包裝: 500
特點(diǎn): *
FIFO's: 16 字節(jié)
規(guī)程: 打印機(jī)
電源電壓: 5V
帶并行端口:
安裝類型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 帶卷 (TR)
TABLE 7: "NIBBLE MODE" SIGNAL DESCRIPTIONS
SIGNAL NAME
SIGNAL TYPE
NIBBLE MODE NAME
DESCRIPTION
-STROBE
O
-STROBE
Not used for reverse data transfer.
-AUTOFD
O
HostBusy
Host nibble mode handshake signal. Set low to indicate host
is ready for nibble. Set high to indicate nibble has been
received.
-SLCTIN
O
1284Active
Set high when host is in a 1284 transfer mode.
INIT
O
INIT
Not used for reverse data transfer.
-ACK
I
PtrClk
Set low to indicate valid nibble data, set high in response to
"HostBusy" going high.
BUSY
I
PtrBusy
Used for Data Bit-3, then Bit-7.
PE
I
AckDataReq
Used for Data Bit-2, then Bit-6.
SLCT
I
Xflag
Used for Data Bit-1, then Bit-5.
-ERROR
I
-DataAvail
Used for Data Bit-0, then Bit-4.
PD0-PD7
O
N/A
Not used.
ST78C36/36A
15
REV. 5.1.0
ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO
5.1
NIBBLE Mode Data Transfer Cycle
Host signals ability to take data by asserting HostBusy low.
Peripheral responds by placing first nibble on status lines.
Peripheral signals valid nibble by asserting PtrClk low.
Host sets HostBusy high to indicate that it has received the nibble and is not ready for another nibble.
Peripheral sets PtrClk high to acknowledge host.
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