Specifications

ESS Technology, Inc. SAM0025A-062397 39
ES1879 DATA SHEET
CONFIGURATION
PRELIMINARY
LDN 2: Joystick Device
Activate (30h, R/W)
After reset or after a 1 is written to the reset bit in the card’s
configuration control bit, the default for this register is 0.
Bit Definitions:
I/O Range Check (31h, R)
This register verifies that the I/O range assigned to a
logical device does not conflict with the I/O range used by
another device.
Bit Definitions:
I/O Decoder 0 Base Address (60h, R/W)
I/O base address, bits 11:8. One location.
I/O Decoder 0 Base Address (61h, R/W)
I/O base address, bits 7:0.
LDN 3: MPU-401 Device
The MPU-401, as an independent device, is optional;
normally MPU-401 is part of the
Audio
Drive
®
solution.
Activate (30h, R/W)
After reset or after a 1 is written to the reset bit in the card’s
configuration control bit, the default for this register is 0.
Bit Definitions:
I/O Range Check (31h, R)
This register verifies that the I/O range assigned to a
logical device does not conflict with the I/O range used by
another device.
Bit Definitions:
I/O Decoder 0 Base Address (60h, R/W)
I/O base address, bits 11:8. Two locations.
I/O Decoder 0 Base Address (61h, R/W)
I/O base address, bits 7:0.
0 Activate
7654321 0
Bits Name Description
7:1 – Reserved. Always write 0.
0 Activate 1 = Activate.
0 = Deactivate (default).
0 Enable range check Pattern select
765432 1 0
Bits Name Description
7:2 – Reserved. Always write 0.
1 Enable
range
check
1 = Enable range check.
0 = Disable.
0 Pattern
select
1 = 55h.
0 = AAh.
0A[11:8]
765 43 2 1 0
A[7:0]
765 43 2 1 0
0 Activate
7654321 0
Bits Name Description
7:1 – Reserved. Always write 0.
0 Activate 1 = Activate.
0 = Deactivate (default).
0 Enable range check Pattern select
765432 1 0
Bits Name Description
7:2 – Reserved. Always write 0.
1 Enable
range
check
1 = Enable range check.
0 = Disable.
0 Pattern
select
1 = 55h.
0 = AAh.
0 A[11:8]
7654321 0
A[7:0]
7654321 0