ATSGA204A データシートの表示（PDF） - Microchip Technology
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ATSGA204A Datasheet PDF : 93 Pages
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ATSHA204A
Device Organization
2. Device Organization
The device contains the following memory blocks:
• EEPROM
• SRAM
2.1 EEPROM Organization
The EEPROM contains a total of 664-bytes (5312-bits) and is divided into the following zones:
Table 2-1. ATSHA204A Zones
Zone
Description
Nomenclature
Data
Zone of 512 bytes (4.0 kb) split into 16 general purpose read-only or Slot<YY> = The entire
read/write memory slots of 32 bytes (256 bits) each that can be
contents stored in Slot YY
used to store keys, calibration data, model number, or other
of the Data zone.
information, typically that relate to the item to which the ATSHA204A
device is attached. Access policy of each data slot is determined by
the values programmed into the corresponding configuration values.
However, the policies become effective upon setting the LockValue
byte only.
Configuration
Zone of 88 bytes (704 bits) EEPROM that contains the serial
number and other ID information, as well as, access the permission
information for each slot of the data memory. The values
programmed into the configuration zone determine the access
policy of how each data slot responds. The configuration zone can
be modified until it has been locked (LockConfig set to !=0x55).
In order to enable the access policies, the LockValue byte must be
set. (See section above)
SN<a:b> = A range of
bytes within a field of the
Configuration zone.
One Time
Programmable
(OTP)
Zone of 64 bytes (512 bits) of OTP bits. Prior to locking the
OTPzone, the bits may be freely written using the standard Write
command. The OTP zone can be used to store read-only data or
one-way fuse type consumption logging information.
OTP<bb> = A byte within
the OTP zone, while
OTP<aa:bb> indicates a
range of bytes.
Terms discussed within this document have the following meanings:
Table 2-2. Document Terms
Term
Meaning
Block
A single 256-bit (32-byte) area of a particular memory zone. Industry SHA-256 documentation uses the
term “block” to indicate a 512-bit section of the message input. In addition, the I/O section of this
document uses the term “block” to indicate a variable-length aggregate element transferred between
the system and the device.
Slot
For the data zone the terms “Block” and “Slot” can be used interchangeably. For the OTP and Config
zone there are multiple blocks of 32 Bytes each.
param<b> Indicates one bit of parameter or byte field.
SRAM Contains input and output buffers, as well as state storage locations. See Section Static RAM (SRAM)
© 2018 Microchip Technology Inc.
DS40002025A-page 8
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