Rainbow Electronics AT88SA100S - Manual (Page 14)

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AT88SA100S [Preliminary]
8558A–SMEM–03/09
4.2. Read
Reads 4 bytes from Fuse, ROM or MemValid. Any attempt to present the chip with an illegal Fuse address will result in
an error return.
Table 10. Input Parameters
Name Size Notes
Opcode READ 1 0x02
Param1 Mode 1 Fuse, ROM or MemValid. Refer to 1.1.
Param2 Address 2
Which 4 bytes within array. Bits 2-15 are ignored by the chip
and should be 0’s.
Data – 0
Table 11. Output Parameters
Name Size Notes
Contents 4 The contents of the specified memory location.
Table 12. Mode Encoding
Name Value Notes
ROM 0x00 Reads four bytes from the ROM. Bit 1 of the address parameter must be 0.
Fuse 0x01 Reads the value of 32 fuses. Bit 1 of the address parameter must be 1. The
LSB of the first byte returned contains the fuse numbered address<<5, and
so on.
MemValid 0x03 Returns four bytes. The LSB of the first byte indicates whether or not the
contents of the SRAM are valid. All other bits in all bytes have a value of 0.
The address parameter is ignored.