Rev. 3.0, 03/01, page 175 of 390
Table 13.6
ECP Register Definition
Name
Address
I/O
ECP Mode
Function
data
H'1000A000
R/W
000-001
Data Register
ecpAFifo
H'1000A000
R/W
011
ECP FIFO (Address)
dsr
H'1000A002
R/W
All
Status Register
dcr
H'1000A004
R/W
All
Control Register
cFifo
H'1000A010
R/W
010
Parallel Port Data FIFO
ecpDFifo
H'1000A010
R/W
011
ECP FIFO (DATA)
tFifo
H'1000A010
R/W
110
Test FIFO
cnfgA
H'1000A010
R
111
Configuration Register A
cnfgB
H'1000A012
R/W
111
Configuration Register B
ecr
H'1000A014
R/W
All
Extended Control Register
Table 13.7
ECP Mode Description
Mode
ECR[7:5]
Description
000
Standard Parallel Port Mode: The FIFO is reset and the direction bit dcr(5) is always
zero (forward direction) in this mode.
001
PS/2 Parallel Port Mode: It is similar to the SPP mode, except that the dcr(5) is
READ/WRITE. When dcr(5) is one, the PD bus is tristate. Reading the data port
returns the value on the PD bus instead of the value of the data register.
010
Parallel Port FIFO Mode: This mode is similar to the 000 mode, except that the Host
writes the data bytes to the FIFO. The FIFO data is then automatically sent to the
peripheral using the standard parallel port protocol. This mode is only valid in the
forward direction (dcr(5)=0).
011
ECP Parallel Port Mode: In the forward direction, bytes placed into the ecpDFifo and
ecpAFifo are placed in a single FIFO and automatically sent to the peripheral under
ECP protocol. In the reverse direction, bytes are sent tot the ecpDFifo from ECP port.
100, 101
Reserved, not defined.
110
Test Mode: In this mode, the FIFO may be read from or written to, but it cannot be
sent to peripheral.
111
Configuration Mode: In this mode, the cnfgA and cnfgB registers are accessible at
0x400 and 0x401.
(1) Data Port Register (Address H'1000A000, Mode 000 and 001)
Its contents will be cleared by a RESET. In a WRITE operation, the contents are then sent without
being inverted to PD0 - PD7. The contents of data ports are read and sent to the host in a READ
operation.
Summary of Contents for HD64465
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