Rainbow-electronics AT88SA100S Manuel d'utilisateur télécharger pdf (Page 8)

8 AT88SA100S [Preliminary]

8558A–SMEM–03/09

3.1. IO Flags

The host system is always the bus master, so before any IO transaction, the system must first send an 8 bit flag to the

chip to indicate the IO operation that is to be performed, as follows:

Value 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 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.

3.1.1. 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 5. Command Timing

Parameter Symbol

Max Unit Notes

ParsingDelay

PARSE

0 50

μs

Delay to check CRC and parse opcode and parameters

before an error indication will be available

MemoryDelay

EXEC_MEM

50 100

μs

Delay to execute Read, Write and/or SramLock commands

FuseDelay

EXEC_FUSE

150 300

μs

Delay to execute BurnFuse commands

MacDelay

EXEC_MAC

15 30 ms Delay to execute MAC command

PersonalizeDelay

PERSON

7 15 ms Delay to execute GenPersonalizationKey or LoadSram

In this document, t

EXEC

is used as shorthand for the delay corresponding to whatever command has been sent to the

chip.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 20 21

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Rainbow-electronics AT88SA100S Manuel d'utilisateur Page 8

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