FDC37M817-MS Standard Microsystems (SMSC), FDC37M817-MS Datasheet - Page 91

• Manufacturer Part Number: FDC37M817-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37M817-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

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.
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Vocabulary
The following terms are used in this document:
assert:
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
Note 1: These registers are available in all modes.
Note 2: All FIFOs use one common 16 byte FIFO.
Note 3: The ECP Parallel Port Config Reg B reflects the IRQ and DRQ selected by the Configuration
High performance half-duplex forward and
reverse channel
Interlocked
transfer
Optional single byte RLE compression for
improved throughput (64:1)
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
When a signal asserts it transitions to a
"true" state, when a signal deasserts it
transitions to a "false" state.
Registers.
Addr/RLE
compress
nBusy
PD7
D7
0
0
handshake,
intrValue
MODE
nAck
PD6
D6
0
0
for
Direction
PError
fast reliable
PD5
D5
0
Parallel Port IRQ
Parallel Port Data FIFO
nErrIntrEn
ackIntEn
ECP Data FIFO
Select
PD4
D4
Test FIFO
1
Address or RLE field
91
forward: Host to Peripheral communication.
reverse: Peripheral to Host communication
Pword: A port word; equal in size to the width of
1
0
These terms may be considered synonymous:
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Reference Document:
Capabilities Port Protocol and ISA Interface
Standard, Rev 1.14, July 14, 1993.
document is available from Microsoft.
The bit map of the Extended Parallel Port
registers is:
SelectIn
dmaEn
nFault
PD3
D3
the ISA interface. For this implementation,
PWord is always 8 bits.
PeriphClk, nAck
HostAck, nAutoFd
PeriphAck, Busy
nPeriphRequest, nFault
nReverseRequest, nInit
nAckReverse, PError
Xflag, Select
ECPMode, nSelectln
HostClk, nStrobe
0
A high level.
A low level.
serviceIntr
PD2
nInit
D2
0
0
Parallel Port DMA
autofd
PD1
D1
full
0
0
IEEE 1284 Extended
strobe
empty
PD0
D0
0
0
Note
2
1
1
2
2
2
This