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)： 109/152頁
文件大小： 621K
代理商： FDC37C666GT
109
Command/Data
ECP Mode supports two advanced features to
improve the effectiveness of the protocol for
some
applications.
implemented by allowing the transfer of normal
8-bit data or 8-bit commands.
The
features
are
When in the forward direction, normal data is
transferred when HostAck is high and an 8-bit
command is transferred when HostAck is low.
The most significant bit of the command
indicates whether it is a run-length count (for
compression) or a channel address.
When in the reverse direction, normal data is
transferred when PeriphAck is high and an 8-bit
command is transferred when PeriphAck is low.
The most significant bit of the command is
always zero. Reverse channel addresses are
seldom used and may not be supported in
hardware.
Table 45
Forward Channel Commands (HostAck Low)
Reverse Channel Commands (PeripAck Low)
D7
0
Run-Length Count (0-127)
(mode 0011 0X00 only)
1
Channel Address (0-127)
D[6:0]
Data Compression
The FDC37C665GT/666GT supports run length
encoded (RLE) decompression in hardware and
can transfer compressed data to a peripheral.
Run length encoded (RLE) compression in
hardware is not supported. To transfer
compressed
data
in
compression count is written to the ecpAFifo
and the data byte is written to the ecpDFifo.
ECP
mode,
the
Compression is accomplished by counting
identical bytes and transmitting an RLE byte
that indicates how many times the next byte is
to be repeated. Decompression simply
intercepts the RLE byte and repeats the
following byte the specified number of times.
When a run-length count is received from a
peripheral, the subsequent data byte is
replicated the specified number of times. A
run-length count of zero specifies that only one
byte of data is represented by the next data
byte, whereas a run-length count of 127
indicates that the next byte should be expanded
to 128 bytes. To prevent data expansion,
however, run-length counts of zero should be
avoided.
Pin Definition
The drivers for nStrobe, nAutoFd, nInit and
nSelectIn are open-collector in mode 000 and
are push-pull in all other modes.
ISA Connections
The interface can never stall causing the host to
hang. The width of data transfers is strictly
controlled on an I/O address basis per this
specification. All FIFO-DMA transfers are byte
wide, byte aligned and end on a byte boundary.
(The PWord value can be obtained by reading
Configuration Register A, cnfgA, described in
the next section.) Single byte wide transfers
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