Specifications

24 SAM0023-122898 ESS Technology, Inc.
ES1869 DATA SHEET
PERIPHERAL INTERFACING
Figure 15 MIDI Serial Interface
Serial EEPROM Interface
The ES1869 gets Plug and Play configuration data from
an internal masked ROM or an external EEPROM device.
The external EEPROM device is 512K x 8-bit in size.
The EEPROM interface is shared with the hardware
volume controls. When the EEPROM interface is active,
the volume controls are deactivated. See Figure 16.
The host processor can read or write the EEPROM,
allowing the EEPROM to be reprogrammed or initially
programmed during production test.
Pin 20, when used as SECS, is an input during reset. If an
EEPROM exists and needs to be used, pull this pin high
externally. Otherwise, pull it low, to force the use of the
internal ROM.
Depending on the value of pin 20 and the operating mode
selected for this pin, either the internal mask-ROM or the
external EEPROM device is used.
EEPROM ROM Format
'A5' Sync Byte
IRQB IRQA Mapping for IRQB/A
IRQD IRQC Mapping for IRQD/C
IRQF IRQE Mapping for IRQF/E
DRQB DRQA Mapping for DRQB/A
DRQD DRQC Mapping for DRQD/C
PNP Reg 25h Miscellaneous
PNP Reg 26h Miscellaneous
Figure 16 Serial EEPROM – Typical Application
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
1
2
2
3
4
3
4
5
5
JOYSTICK PORT
DB15P
ISO1
R5
5.6K
R1
10K
R4
2.2K
R2
270
R3
220
C1
220pF
C2
220pF
Q2
2N3904
Q1
2N3904
R6
270
D1
DIN
DIN
J1
J2
MIDI IN
MIDI OUT
SECS/PSEL
0 Internal ROM
1 93LC66 512 x 8 9 address bits
ES1869
SEDI/VOLUP
SEDO/VOLDN
SECLK/MUTE
SECS/PSEL
DI
DO
CLK
CS
93LC66
mute
vol down
vol up
(512K x 8-bit serial EEPROM)