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AT88SA102S-SH-T 数据表(PDF) 10 Page - ATMEL Corporation |
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AT88SA102S-SH-T 数据表(HTML) 10 Page - ATMEL Corporation |
10 / 24 page 10 Atmel AT88SA102S 8584F–SMEM–8/10 4.1. IO Flags The system is always the bus master, so before any IO transaction, the system must send an 8-bit flag Value to the chip to indicate the IO operation that is to be performed, as follows: Name Meaning 0x77 Command After this flag, the system starts sending a command block to the chip. The first bit of the block can follow immediately after the last bit of the flag. 0x88 Transmit After a turn-around delay, the chip will start transmitting the response block for a previously transmitted command block. 0xCC Sleep Upon receipt of a sleep flag, the chip will enter a low power mode until the next Wake token is received. All other values are reserved and will be ignored. As the single signal wire may be shared with an Atmel ® CryptoAuthentication host chip, the Atmel AT88SA102S chip includes a PauseLong command which causes it to ignore all activity on the signal pin until the expiration of the watchdog timer. 4.1.1. Command Timing After a command flag is transmitted, a command block should be sent to the chip. During parsing of the parameters and subsequent execution of a properly received command, the chip will be busy and not respond to transitions on the signal pin. The delays for these operations are listed in the table below: Table 4-1. Command Timing Parameter Symbol Max Unit Notes Parsing Delay t PARSE 100 µs Delay to check CRC and parse opcode and parameters before an error indication will be available MacDelay t EXEC_MAC 30 ms Delay to execute MAC command MemoryDelay t EXEC_READ 3 ms Delay to execute Read command Fuse Delay t EXEC_FUSE 700 µs Delay to execute BurnFuse command at V cc > 4.5V See Section 5.3 for more details. SecureDelay t EXEC_SECURE 36 ms Max delay to execute BurnSecure command at V cc > 4.5V See Section 5.5 for more details. PersonalizeDelay t PERSON 13 ms Delay to execute GenPersonalizationKey In this document, t EXEC is used as shorthand for the delay corresponding to whatever command has been sent to the chip. 4.1.2. Transmit Flag The Transmit flag is used to turn around the signal so that the Atmel ® AT88SA102S can send data back to the system, depending on its current state. The bytes that the AT88SA102S returns to the system depend on its current state as follows: |
类似零件编号 - AT88SA102S-SH-T |
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类似说明 - AT88SA102S-SH-T |
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