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9. MPR CARD CIRCUIT OPERATION
9.1. MPR CARD
9.1.1. Outline
1) Function
- System Control
- Circuit Switching (includes gain adjustment function)
- Conference Call (3 people x 8 ~ 8 people x 3)
- MOH
- PAGING
- Clock
2) Configuration
- Power Supply: DC/DC Converter
- CPU: HITACHI SH7709S (133MHz)
- ASIC: Our own products
- ROM: 4Mbit x 1 (for boot programs)
- SDRAM: 64Mbit x 2 (for work area)
- SRAM: 4Mbit x 2 (for user data backup)
- SD card I/F (for operating programs) x 1
- USB I/F (for PC programming) x 1
- MOH: External sound input x 2
- PAGING: External output x 2
- Expanded memory connector x 1
- Modem card connector x 1
3) Operation Rating
- Power Input : +15V
- Power Output : +15V (for MOH)
+3.3V (for I/O)
+3.3VBB (back board signal line pull-up)
+3.3VB (for SRAM backup)
+1.8V (for CPU core)
+1.9VB (for clocking backup)
±9.4V (for RS-232C driver/receiver)
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