Rev. 3.0, 03/01, page 171 of 390
Section 13 Parallel Port
13.1
Overview
The Parallel Port module supports an IBM AT, PS/2 compatible bi-directional parallel port (SPP),
the Enhanced Parallel Port (EPP) and the Extended Capabilities Port (ECP). But NO DMA
transfers are supported in this module.
13.2
Features
•
Support SPP, EPP and ECP modes
•
Standard mode – bi-directional SPP
•
Enhanced mode – EPP v1.7 and EPP v1.9 compliant
•
High speed mode – ECP, IEEE 1284 compliant
•
Backdrive current reduction
•
Printer power-on damage reduction
•
No DMA mode is supported in ECP mode
13.3
Parallel Port Register Description
Host Connector Pins
SPP
EPP
ECP
1
STB#
WRITE#
nStrobe
2 - 9
PD0 - PD7
PD0 - PD7
PD0 - PD7
10
ACK#
INTR
nAck
11
BUSY
WAIT#
Busy PeriphAck (2)
12
PE
(NU) (1)
Perro nAckReverse (2)
13
SLCT
(NU) (1)
Select
14
AFD#
DSTB#
nAutoFd HostAck(2)
15
ERR#
(NU) (1)
nFault nPeriphRequest (2)
16
INIT#
(NU) (1)
nInit nReverseRequest (2)
17
SLIN#
ASTB#
nSelectIn
Notes: 1. NU: Not used
2. Fast mode
3. For more information, please refer to the IEEE 1284 standard.
Summary of Contents for HD64465
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