LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 80

• Manufacturer Part Number: LPC47B272-MS
• Description: IC CTRLR SUPER I/O LPC 100-QFP
• Manufacturer: SMSC

Specifications of LPC47B272-MS

• Controller Type: I/O Controller
• Interface: LPC
• Voltage - Supply: 3.3V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1019

These terms may be considered synonymous:
PeriphClk, nAck
HostAck, nAutoFd
PeriphAck, Busy
nPeriphRequest, nFault
nReverseRequest, nInit
nAckReverse, PError
Xflag, Select
ECPMode, nSelectln
HostClk, nStrobe
Reference Document: IEEE 1284 Extended Capabilities Port Protocol and ISA Interface Standard, Rev
1.14, July 14, 1993. This document is available from Microsoft.
The bit map of the Extended Parallel Port registers is:
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 DMA channel selected by the
ECP IMPLEMENTATION STANDARD
This specification describes the standard interface to the Extended Capabilities Port (ECP). All LPC
devices supporting ECP must meet the requirements contained in this section or the port will not be
supported by Microsoft. For a description of the ECP Protocol, please refer to the IEEE 1284 Extended
Capabilities Port Protocol and ISA Interface Standard, Rev. 1.14, July 14, 1993. This document is
available from Microsoft.
Description
The port is software and hardware compatible with existing parallel ports so that it may be used as a
standard LPT port if ECP is not required. The port is designed to be simple and requires a small number of
gates to implement. It does not do any "protocol" negotiation, rather it provides an automatic high
burst-bandwidth channel that supports DMA for ECP in both the forward and reverse directions.
Small FIFOs are employed in both forward and reverse directions to smooth data flow and improve the
maximum bandwidth requirement. The size of the FIFO is 16 bytes deep. The port supports an automatic
handshake for the standard parallel port to improve compatibility mode transfer speed.
The port also supports run length encoded (RLE) decompression (required) in hardware. 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. Hardware support for compression is optional.
SMSC LPC47B27x
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
nStrobe
PData 7:0
NAME
Configuration Registers.
Addr/RLE
compress
nBusy
PD7
D7
0
0
TYPE
I/O
O
intrValue
MODE
nAck
PD6
D6
0
0
During write operations nStrobe registers data or address into the slave on
the asserting edge (handshakes with Busy).
Contains address or data or RLE data.
Table 41 - ECP Pin Descriptions
Direction
PError
PD5
D5
0
DATASHEET
Parallel Port IRQ
Parallel Port Data FIFO
nErrIntrEn
ackIntEn
ECP Data FIFO
Select
PD4
D4
Test FIFO
1
Address or RLE field
- 80 -
SelectIn
dmaEn
nFault
DESCRIPTION
PD3
D3
0
serviceIntr
PD2
nInit
D2
0
0
Parallel Port DMA
autofd
PD1
D1
full
0
0
strobe
empty
PD0
D0
0
0
Rev. 04-17-07
Note
2
1
1
2
2
2