Specifications

ESS Technology, Inc. SAM0025A-062397 37
ES1879 DATA SHEET
CONFIGURATION
PRELIMINARY
LDN 0: Configuration 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)
This register is used to assign an I/O base address to I/O
decoder 0 of the logical device. I/O base address, bits
11:8.
I/O Decoder 0 Base Address (61h, R/W)
I/O base address, bits 7:3.
LDN 1: Audio Device
This device actually supports three functions: audio, FM,
and MPU-401. Audio requires sixteen I/O locations, one
interrupt that is shared with MPU-401, and two DMA
channels. FM requires four I/O locations. MPU-401
requires two I/O locations.
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:
Audio Microcontroller I/O Base Address (60h, R/W)
I/O base address of audio microcontroller, bits 11:8.
Sixteen locations.
Audio Microcontroller I/O Base Address (61h, R/W)
I/O base address of audio microcontroller, bits 7:4.
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[7:3] 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[7:4] 0
7654321 0