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PCM16C010 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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PCM16C010 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 38 page  50 Functional Description (Continued) NAND EN This bit if set to one (1) configures the func- tion as a NAND Flash (NM29N16) interface (see Section 544 for specific function details) If set to zero (0) the func- tion assumes normal IO interface functionality Watchdog Time-Out Register 0x03FC D7 D6 D5–D0 RFU Wait Tout Enable RFU Wait Tout Enable When this bit is set to a one (1) the HWAIT time-out watchdog timer is enabled In addition the ability to set Intr in the Function Configuration Option Register Intr in the Card Configuration Register and IREQ is enabled once the watchdog timer expires The watchdog timer may expire if HWAIT is asserted for more than approximately 112 ms when MCLK is set to 20 MHz This prevents the system from hanging due to prolonged HWAIT assertions If this bit is reset to zero (0) Wait Tout and its associated interrupt capability is disabled during HWAIT assertions ID Register 0x1000 This read only register provides the software with IC revision information D7–D3 D2–D0 PCM16C010 Code e 00010b Revision Code e 001b NSC PCM16C010 Code This code may be used to identi- fy the NSC PCM16C010 IC The value of bits D7 – D3 of this register is 00010 which when appended to the three bits of the revision code produce 00010 xxx which is 1x hex Revision Code This will uniquely identify the silicon ver- sion of the PCM16C010 IC as 001b EEPROM Access In order to avoid accidental EEPROM overwrite the PCM16C010 utilizes two registers that must be written with the proper byte sequence in order to enable EEPROM writes In order to initiate an EEPROM write the following register write sequence must be executed Register Attribute Register Address Hex Data EE Control Reg 1002 2E EE Security Reg 1004 B7 EE Control Reg 1002 91 Failure to initiate the exact sequence will disable writes regardless of the value placed in the WriteEEPROM or EEPROMWriteEn bits of the EEPROM Control Register EEPROM Control Register 0x1002 This register (in conjunction with the EEPROM Security Register for writes) controls reading and writing the EEPROM as well as the EEPROM enable D7 D6 D5–D1 D0 WriteEEPROM ReadEEPROM Reserved EEPROMWriteEn WriteEEPROM When set this tells the EEPROM control- ler to copy the contents of the PCM16C010 Shadow RAM to the EEPROM provided the proper write security sequence listed above has been executed Once the EEPROM write has completed the EEPROM controller clears this bit ReadEEPROM When set this tells the EEPROM control- ler to copy the contents of the EEPROM to the shadow RAM Once done the EEPROM controller clears this bit Any data modified in the Shadow RAM that has not first been written back to the EEPROM will be lost The EEPROM may be read independent of the value in the EEPROMWriteEnable bit EEPROMWriteEn This must be set to allow EEPROM writes If clear the EEPROM may not be written The default value at reset is low The EEPROM may be read indepen- dent of the value of this bit Note 1 Upon power-up the PCM16C010 EEPROM controller copies the entire contents of the lower 1 kbytes of the EEPROM into the Shad- ow RAM independent of writing to the EEPROM Control Register Note 2 The PCM16C010 EEPROM controller stores data in a 16-bit orga- nized EEPROM in lowhigh format Although Attribute Memory is on even byte boundaries only the entire EEPROM’s address space is used This eliminates waste of EEPROM memory Therefore the Attribute space used by the Shadow RAM is double the actual size of the EEPROM For example if a 16-bit EEPROM is pre-pro- grammed the low byte at word 0 in the EEPROM will be shadowed at Attribute location 0x0000 and the high byte will be shadowed at Attribute location 0x0002 The low byte at EEPROM word 1 will be shadowed to Attribute location 0x0004 etc EEPROM Security Register 0x1004 This register in conjunction with the EEPROM Control Reg- ister is used to prevent accidental EEPROM overwriting When written in the proper sequence as outlined above with hex data B7 it allows EEPROM write access 532 PC Card Register Function Configuration Option Register 0x1020 D7 D6 D5–D0 SRESET LevIREQ Function Configuration Index http www nationalcom 11 |
Similar Part No. - PCM16C010 |
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Similar Description - PCM16C010 |
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