SP37E760 Datasheet, PDF (27/78 Pages) SMSC Corporation – 3.3 V I/O CONTROLLER FOR EMBEDDED APPLICATIONS

5 PARALLEL PORT
The SP37E760 incorporates an IBM XT/AT compatible parallel port. The SP37E760 supports the optional PS/2 type
bi-directional parallel port (SPP), the Enhanced Parallel Port (EPP) and the Extended Capabilities Port (ECP) parallel
port modes. Refer to the SP37E760 Configuration Registers and the following hardware configuration description for
information on disabling, powering down, changing the base address, and selecting the mode of operation of the
parallel port.
The SP37E760 also incorporates SMSC’s ChiProtect circuitry, which prevents possible damage to the parallel port
due to printer power-up.
The functionality of the Parallel Port is achieved through the use of eight addressable ports, with their associated
registers and control gating. The control and data port are read/write by the CPU, the status port is read/write in the
EPP mode. The address map and bit encoding of the Parallel Port registers is shown in Table 13; the Parallel Port
Connector is shown in Table 14.
DATA PORT¹
STATUS PORT¹
CONTROL PORT¹
EPP ADDR
PORT^2,3
EPP DATA PORT
0^2,3
EPP DATA PORT
1^2,3
EPP DATA PORT
2^2,3
EPP DATA PORT
3^2,3
Table 13 - Parallel Port Registers
BASE
ADDRESS
OFFSET _D0
D1
D2 D3
00H
PD0
PD1 PD2 PD3
01H TMOUT 0
0 nERR
02H STROB AUTOFD nINIT SLC
E
03H
PD0
PD1 PD2 PD3
D4
PD4
SLCT
IRQE
PD4
04H
PD0
PD1 PD2 PD3 PD4
05H
PD0
PD1 PD2 PD3 PD4
06H
PD0
PD1 PD2 PD3 PD4
07H
PD0
PD1 PD2 PD3 PD4
D5
PD5
PE
PCD
PD5
PD5
PD5
PD5
PD5
D6 D7
PD6 PD7
nACK nBUSY
0
0
PD6 AD7
PD6 PD7
PD6 PD7
PD6 PD7
PD6 PD7
Note¹
Note²
Note³
These registers are available in all modes.
These registers are only available in EPP mode.
For EPP mode, IOCHRDY must be connected to the ISA bus.
HOST
CONNECTOR
1
2-9
10
11
12
Table 14 - Parallel Port Connector
PIN #
TQFP
QFP
STANDARD
EPP
75
77
nSTROBE
nWrite
69-66,64-61 71-68, 66-63 PD<0:7>
PData<0:7>
60
62
nACK
Intr
59
61
BUSY
nWait
58
60
PE
(NU)
13
57
59
SLCT
(NU)
14
74
76
nAUOTFD
nDatastb
15
73
75
nERROR
(NU)
16
72
74
nINIT
(NU)
17
71
73
nSLCTIN
nAddrstrb
ECP
nStrobe
PData<0:7>
nAck
Busy, PeriphAck(3)
PError,
nAckReverse(3)
Select
nAutoFd,
HostAck(3)
nFault(1)
nPeriphRequest(3)
nInit(1)
nReverseRqst(3)
nSelectIn(1,3)
SMSC DS – SP37E760
Rev. 04/13/2001