- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
63
9.2. Communication with Peripheral ICs
9.2.1. Connection of Communication Bus between DSP (CXD3172AR) and
Peripheral ICs
With the SS-HQ1 system, the DSP (CXD3172AR), EEPROM (AK6480A or BR9080A) and EVR (MB88347L)
are connected through serial communication and the peripheral ICs are controlled through the DSP in order to
realize various functions.
Note:
The chip-select signal assignments for peripheral ICs are fixed in the DSP’s firmware, and are not
customizable by the user. In addition, it is not possible to share the serial communication line with ICs other
than those listed in the table below. Use the dedicated serial communication line when adding an external
microcomputer to the SS-HQ1 system. For details, see “12.4 When Using the External Microcomputer”.
9.2.2. Pin Connections for Serial Communication with Individual ICs
Use the pin connections in the following table to connect the DSP with peripheral ICs.
Table 9.2-1 Serial Communication Pin Connections inside the SS-HQ1 system
CXD3172AR
Signal name
Pin No
I / O
Connected IC
Signal
name
Pin No
Remarks
EEPROM SK 4
CASCK 9
OUT
EVR CLK
13
Serial clock output
(DSP -> ICs)
EEPROM DI 5
CASO 8
OUT
EVR DI
14
Serial data output
(DSP -> ICs)
CASI 7
IN
EEPROM
DO
6
Serial data input
(ICs -> DSP)
CSROM 6
OUT
EEPROM
CS
3
EEPROM Chip Select
(Low active)
S4
49 OUT
(CSEVR)
P3
94 OUT
LD 12
EVR Chip Select
(High edge)
NC (connected prohibited)
EVR
DO 11
Use with output pin set to
OPEN
* The CXD3172AR does not have a dedicated pin for CSEVR. Assign it to the S4 pin or P3 pin. For details
on the setting procedure, see “3.5.2 Communication Control with an External EVR”.
The S4 pin is assigned as the initial setting in the CXD3172AR.