CYWUSB6953_10 datasheet(23/68 Pages) CYPRESS

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CYRF69103

Document #: 001-07611 Rev *F

Page 23 of 68

14.5.6 EraseAll Function

The EraseAll function performs a series of steps that destroy the

user data in the Flash macros and resets the protection block in

each Flash macro to all zeros (the unprotected state). The

EraseAll function does not affect the three hidden blocks above

the protection block in each Flash macro. The first of these four

hidden blocks is used to store the protection table for its eight

Kbytes of user data.

The EraseAll function begins by erasing the user space of the

Flash macro with the highest address range. A bulk program of

all zeros is then performed on the same Flash macro, to destroy

all traces of the previous contents. The bulk program is followed

by a second erase that leaves the Flash macro in a state ready

for writing. The erase, program, erase sequence is then

performed on the next lowest Flash macro in the address space

if it exists. Following the erase of the user space, the protection

block for the Flash macro with the highest address range is

erased. Following the erase of the protection block, zeros are

written into every bit of the protection table. The next lowest

Flash macro in the address space then has its protection block

erased and filled with zeros.

The end result of the EraseAll function is that all user data in the

Flash is destroyed and the Flash is left in an unprogrammed

state, ready to accept one of the various write commands. The

protection bits for all user data are also reset to the zero state.

The parameter block values that must be set, besides the keys,

are the CLOCK and DELAY values.

14.5.7 TableRead Function

The TableRead function gives the user access to part specific

data stored in the Flash during manufacturing. It also returns a

Revision ID for the die (not to be confused with the Silicon ID).

The table space for the CYRF69103 is simply a 64 byte row

broken up into eight tables of eight bytes. The tables are

numbered zero through seven. All user and hidden blocks in the

CYRF69103 consist of 64 bytes.

An internal table holds the Silicon ID and returns the Revision ID.

The Silicon ID is returned in SRAM, while the Revision ID is

returned in the CPU_A and CPU_X registers. The Silicon ID is a

value placed in the table by programming the Flash and is

controlled by Cypress Semiconductor Product Engineering. The

Revision ID is hard coded into the SROM. The Revision ID is

discussed in more detail later in this section.

An internal table holds alternate trim values for the device and

returns a one-byte internal revision counter. The internal revision

counter starts out with a value of zero and is incremented each

time one of the other revision numbers is not incremented. It is

reset to zero each time one of the other revision numbers is

incremented. The internal revision count is returned in the

CPU_A register. The CPU_X register is always set to FFh when

trim values are read. The BLOCKID value, in the parameter

block, is used to indicate which table must be returned to the

user. Only the three least significant bits of the BLOCKID

parameter are used by the TableRead function for the

CYRF69103. The upper five bits are ignored. When the function

is called, it transfers bytes from the table to SRAM addresses

F8h–FFh.

The M8C’s A and X registers are used by the TableRead function

to return the die’s Revision ID. The Revision ID is a 16-bit value

hard coded into the SROM that uniquely identifies the die’s

design.

14.5.8 Checksum Function

The Checksum function calculates a 16-bit checksum over a

user specifiable number of blocks, within a single Flash macro

(Bank) starting from block zero. The BLOCKID parameter is

used to pass in the number of blocks to calculate the checksum

over. A BLOCKID value of 1 calculates the checksum of only

block 0, while a BLOCKID value of 0 calculates the checksum of

all 256 user blocks. The 16-bit checksum is returned in KEY1 and

KEY2. The parameter KEY1 holds the lower eight bits of the

checksum and the parameter KEY2 holds the upper eight bits of

the checksum.

The checksum algorithm executes the following sequence of

three instructions over the number of blocks times 64 to be

checksummed.

romx

add [KEY1], A

adc [KEY2], 0

Table 14-9. EraseAll Parameters

Name

Address

Description

KEY1

0,F8h

3Ah

KEY2

0,F9h

Stack Pointer value when SSC is

executed

CLOCK 0,FCh

Clock Divider used to set the write pulse

width

DELAY

0,FEh

For a CPU speed of 12 MHz set to 56h

Table 14-10. Table Read Parameters

Name

Address

Description

KEY1

0,F8h

3Ah

KEY2

0,F9h

Stack Pointer value when SSC is

executed

BLOCKID 0,FAh

Table number to read

Table 14-11. Checksum Parameters

Name

Address

Description

KEY1

0,F8h

3Ah

KEY2

0,F9h

Stack Pointer value when SSC is

executed

BLOCKID

0,FAh

Number of Flash blocks to calculate

checksum on

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