ATSHA204 datasheet(35/65 Pages) ATMEL

35 / 65 page

Atmel ATSHA204 [DATASHEET]

8740D

−CRYPTO−3/12

8.1.4

Address Encoding

The Read and Write commands include a single address in Param2 that indicates the memory to be accessed. All Reads and

Writes are in units of four bytes (one word). The most-significant byte of a legal ATSHA204 address is always zero. All unused

address bits should always be set to zero. The least-significant bits in the address describe the offset to the first word to be

accessed within the block/slot, while the upper bits specify the block/slot number per the table below:

Table 8-5.

Address Encoding (Param2)

Zone

Byte 1

Byte 0

Unused

Block/Slot

Offset

Config

Bits 0

 7

Bits 5

 7

Bits 3

 4

Bits 0

 2

OTP

Bits 0

 7

Bits 4

 7

Bit 3

Bits 0

 2

Data

Bits 0

 7

Bit 7

Bits 3

 6

Bits 0

 2

Within each zone, there are various access restrictions per the table below:

Table 8-6.

Legal Block/slot Values

Zone

Legal Block/Slot

(inclusive)

Notes

Config

0-2

Addresses below 16 (block 0, offset 16) and above 87 (block 2, offset 23) can never be written.

Addresses above 87 can never be read. Both 4- and 32-byte reads/writes are permitted

OTP

0-1

When OTPmode is read-only, all offsets in both blocks are available to use with 4- or 32-byte

reads.

If OTPmode is consumption, then writes are also permitted to all offsets.

See Section 2.1.3 if OTPmode is Legacy.

Data

0-15

All offsets in all slots available for both read and write.

4-byte access permitted on a particular slot only if SlotConfig.IsSecret is zero.

In the table below, “Byte Address” is the byte address within the data zone for the first byte in the respective slot. Because all

Reads and Writes with the ATSHA204 are performed on a word (4-byte or 32-bit) basis, the word address in the table below

should be used for the address parameter passed to the Read and Write commands.

Table 8-7.

Data Zone Slots

Slot #

Byte Address

(Hex)

Word Address

(Hex)

Slot #

Byte Address

(Hex)

Word Address

(Hex)

0x0000

0x0100

0x0040

0x0020

0x0008

0x0120

0x0048

0x0040

0x0010

0x0140

0x0050

0x0060

0x0018

0x0160

0x0058

0x0080

0x0020

0x0180

0x0060

0x00A0

0x0028

0x01A0

0x0068

0x00C0

0x0030

0x01C0

0x0070

0x00E0

0x0038

0x01E0

0x007F

ATSHA204 Datasheet(PDF) 35 Page - ATMEL Corporation

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