參數(shù)資料
型號: FDC37C666GT
廠商: STANDARD MICROSYSTEMS CORP
元件分類: 存儲控制器/管理單元
英文描述: High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
中文描述: 1 Mbps, IDE COMPATIBLE, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝: QFP-100
文件頁數(shù): 5/152頁
文件大?。?/td> 621K
代理商: FDC37C666GT
5
DESCRIPTION OF PIN FUNCTIONS
BUFFER
TYPE
PIN NO.
NAME
SYMBOL
DESCRIPTION
HOST PROCESSOR INTERFACE
D0-D7
I/O24
48-51
53-56
Data Bus 0-7
The data bus connection used by the host
microprocessor to transmit data to and from
the FDC37C665GT. These pins are in a
high-impedance state when not in the output
mode.
This active low signal is issued by the host
microprocessor to indicate a read operation.
This active low signal is issued by the host
microprocessor to indicate a write operation.
Active high Address Enable indicates DMA
operations on the host data bus. Used
internally to qualify appropriate address
decodes.
These host address bits determine the I/O
address to be accessed during nIOR and
nIOW cycles. These bits are latched
internally by the leading edge of nIOR and
nIOW.
This active high output is the DMA request
for byte transfers of data to the host. This
signal is cleared on the last byte of the data
transfer by the nDACK signal going low (or
by nIOR going low if nDACK was already
low as in demand mode).
An active low input acknowledging the
request for a DMA transfer of data. This
input enables the DMA read or write
internally.
This signal indicates to the FDC37C665GT
that data transfer is complete. TC is only
accepted when nDACK or nPDACK is low.
In AT and PS/2 model 30 modes, TC is
active high and in PS/2 mode, TC is active
low.
44
nI/O Read
nIOR
I
45
nI/O Write
nIOW
I
46
Address Enable
AEN
I
28-34
41-43
I/O Address
A0-A9
I
52
FDC DMA
Request
FDRQ
O24
36
nDMA Acknowle-
dge
nDACK
I
35
Terminal Count
TC
I
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