FDC37C665IR SMSC Corporation, FDC37C665IR Datasheet - Page 98

• Manufacturer Part Number: FDC37C665IR
• Description: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
• Manufacturer: SMSC Corporation

EXTENDED CAPABILITIES PARALLEL PORT
ECP provides a number of advantages, some of
which are listed below. The individual features
are explained in greater detail in the remainder
of this section.
•High performance half-duplex forward and
•Interlocked handshake, for fast reliable transfer
•Optional single byte RLE compression for
•Channel addressing for low-cost peripherals
•Maintains link and data layer separation
•Permits the use of active output drivers
•Permits the use of adaptive signal timing
•Peer-to-peer capability
Vocabulary
The following terms are used in this document:
Assert When a signal asserts it transitions to a
forwardHost to Peripheral communication.
reversePeripheral to Host communication.
Note 1: These registers are available in all modes.
Note 2: All FIFOs use one common 16 byte FIFO.
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
reverse channel
improved throughput (64:1)
"true" state, when a signal deasserts it
transitions to a "false" state.
Addr/RLE
compress
nBusy
PD7
D7
0
0
intrValue
MODE
nAck
PD6
D6
0
0
Direction
PError
PD5
D5
0
0
Parallel Port Data FIFO
nErrIntrEn
ECP Data FIFO
ackIntEn
Select
PD4
Test FIFO
D4
1
0
Address or RLE field
98
PWord A port word; equal in size to the width
1
0
These terms may be considered synonymous:
•.
•.
•.
•.
•.
•.
•.
•.
•.
Reference Document
IEEE 1284 Extended Capabilities Port Protocol
and ISA Interface Standard, Rev 1.09, Jan 7,
1993.
Microsoft.
The bit map of the Extended Parallel Port
registers is:
SelectIn
dmaEn
nFault
PeriphClk, nAck
HostAck, nAutoFd
PeriphAck, Busy
nPeriphRequest, nFault
nReverseRequest, nInit
nAckReverse, PError
Xflag, Select
ECPMode, nSelectln
HostClk, nStrobe
PD3
D3
0
0
of
implementation, PWord is always 8
bits.
A high level.
A low level.
This document is available from
serviceIntr
the
PD2
nInit
D2
0
0
0
ISA
autofd
interface.
PD1
full
D1
0
0
0
strobe
empty
PD0
D0
0
0
0
For
Note
2
1
1
2
2
2
this