SAA7348GP Datasheet, PDF (25/60 Pages) NXP Semiconductors – All Compact Disc Engine ACE

Philips Semiconductors
All Compact Disc Engine (ACE)
Preliminary specification
SAA7348GP
8.1.2 PORT SERVO REGISTER (PSR)
The Port Servo Register is the internal bus used to communicate with the servo. The register is bit addressable; R/W.
The operation of the handshake bits used for serial communications with the servo is outlined in Table 12.
Table 10 Port servo register (address 0XD8H to 0XDFH)
7
Tray_en
6
Tray_pwm
5
Srv_rdy
4
Srv_dacc
3
Srv_sild
2
Srv_sicl
1
Srv_sida
0
Srv_intreqn
Table 11 Description of PSR bits
BIT
SYMBOL ADDRESS
DESCRIPTION
7
Tray_en
0XDFH signal to enable tray driver
6
Tray_pwm 0XDEH PWM signal to tray driver
5
Srv_rdy
0XDDH RDY; see Table 12
4
Srv_dacc
0XDCH DAC; see Table 12
3
Srv_sild
0XDBH SILD
2
Srv_sicl
0XDAH SICL
1
Srv_sida
0XD9H SIDA
0
Srv_intreqn 0XD8H INTREQN
Table 12 Servo serial communication handshake signals
DAC
0
0
1
1
RDY
0
1
0
1
DESCRIPTION
transmit register full; the microcontroller can read a byte or send a new command
idle state, transmit register empty; the microcontroller can transmit a parameter relating
to the new command
received one byte, waiting for EOT
receive register full
1997 Jul 11
25