7188XA/B/C & 7521/2/2A/3/4/7 Series Hardware User’ s Manual, Ver. 2.0 Sep/2002, 7Mh-001-20 -----
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1.3.4 Specifications of 7521/7521D/7522/7522D/7523/7523D
System
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Module name: Intelligent Communication Controller
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CPU: Am188™ES, 20M Hz
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SRAM: 128K bytes
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FLASH ROM: 256K bytes
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COM port: COM1, COM2, COM3, COM4
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Built-in EEPROM
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Supports I/O Expansion Bus (7521/7521D only)
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Program download port: COM1
EEPROM
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2048 bytes ( 8 blocks, each block has 256 bytes)
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Data retention > 100 years
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1,000,000 erase/write cycles
Flash Memory
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256K bytes
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Erase unit is one sector(64K bytes)
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100,000 erase/write cycles
COM1
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RS-232 or RS-485
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RS-232: TXD,RXD,RTS,CTS,GND
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RS-485: D1+, D1-, self-tuner ASIC inside
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Communication speed: 115200 max.
COM2
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RS-485: D2+, D2-, self-tuner ASIC inside
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Communication speed: 115200 max.
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Isolation voltage: 3000V
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