Specifications

30 SAM0023-122898 ESS Technology, Inc.
ES1869 DATA SHEET
PNP CONFIGURATION AND REGISTERS
Resource Data (04h, R)
Returns next byte of resource data, provided the status bit
in register 05h has been polled before each byte read,
indicating that data is ready. Only works in Configuration
mode.
Status (05h, R)
Bit Definitions:
CSN (06h, R/W)
Read/write card select number. Write only works in
Isolation mode. Causes transition to Configuration mode.
Read only works in Configuration mode.
LDN (07h, R/W)
Read/write logical device number. Only works in
Configuration mode.
Vendor-Defined Card-Level Registers (20h-29h)
IRQB, IRQA (20h, R)
Defines IRQ number assigned to B and A pins. Loaded
from Configuration ROM Header after PnP reset. Unused
IRQ pins should be assigned IRQ #1.
IRQD, IRQC (21h, R)
Defines IRQ number assigned to D and C pins. Loaded
from Configuration ROM Header after PnP reset. Unused
IRQ pins should be assigned IRQ #1.
IRQF, IRQE (22h, R)
Defines IRQ number assigned to F and E pins. Loaded
from Configuration ROM Header after PnP reset. Unused
IRQ pins should be assigned IRQ #1.
DRQB, DRQA (23h, R)
Defines DRQ number assigned to B and A pins. Loaded
from Configuration ROM header after PnP reset. Unused
DRQ pins should be assigned DRQ #2.
DRQD, DRQC (24h, R)
Defines DRQ number assigned to D and C pins. Loaded
from Configuration ROM header after PnP reset. Unused
DRQ pins should be assigned DRQ #2.
Configuration ROM Header 0 (25h, R)
Loaded from Configuration ROM header after PnP reset.
Bit Definitions:
Resource data
7 6 5 4 3 2 1 0
Reserved Status
7 6 5 4 3 2 1 0
Bits Name Description
0 Status 1 = Ready to read resource data in register
04h. Only works in Configuration mode.
0 = Resource data not available.
Card select number
7 6 5 4 3 2 1 0
Logical device number
7 6 5 4 3 2 1 0
IRQB IRQA
7 6 5 4 3 2 1 0
IRQD IRQC
7 6 5 4 3 2 1 0
IRQF IRQE
7 6 5 4 3 2 1 0
DRQB DRQA
7 6 5 4 3 2 1 0
DRQD DRQC
7 6 5 4 3 2 1 0
DRQ latch
Motherboard/
card
GP Modem CD-ROM MPU-401
7 6 5 4 3 2 1 0
Bits Name Description
7 DRQ
latch
1 = DRQ latch feature enabled.
0 = DRQ latch feature disabled.
6:5 Mother-
board/
card
ES1869 is on motherboard/add-on card.
4:3 GP General-purpose location.
2 Modem 1 = Modem is LDN 3, 4, or 5.
0 = Modem is not present.
Bit 6 Bit 5 Motherboard/Card
0 0 Motherboard
0 1 Card
1 0 Reserved
1 1 Reserved
Bit 4 Bit 3 General Purpose Location
0 0 GP is not present
0 1 GP is LDN 3,4,5,or 6; GP
uses 4 addresses
1 0 GP uses 8 addresses
1 1 GP uses 16 addresses