Cypress Semiconductor Perform CY8C24x94 User Manual download pdf (Page 14)

14 PSoC® 1 ISSP Programming Specifications, Document No. 001-15239 Rev. *J

Programming Flow

A Bulk Erase operation must be executed to prepare the

flash for programming.

The ERASE vector-set is sent. As before, the programmer

must wait and poll the SDATA line for a HIGH to LOW

transition before continuing with the Program procedure.

To place the actual program image into the flash, the

program portion of the .hex (see Appendix B on page 25) is

read by the programmer in 64-byte blocks. This is written

into the SRAM of the target, one byte at a time, using the

WRITE-BYTE vector whose format is shown in Figure 3-10.

After the programmer completely writes the block into the

target’s SRAM, the block number to be written is set using

the SET-BLOCK-NUM vector. Then the PROGRAM-BLOCK

is sent. The PROGRAM-BLOCK vector executes a write

block operation. Following the previous commands, the

programmer must wait and poll the SDATA line before

continuing. This loop is executed for each 64-byte block of

the program image until the entire program is loaded into the

flash. Note that data can only be written to Flash in 64-byte

blocks.

Figure 3-10. WRITE-BYTE (D7..D0) to Target PSoC 1 (At address A7..A0)

3.4 Verify Procedure

The Verify Procedure, as shown in Figure 3-12 on page 15, is responsible for verification of the programmed Flash.

Flash must be verified to ensure program integrity. This procedure uses a loop to read back the same number of blocks

programmed into the flash. To verify a block of flash, the SET-BLOCK-NUM vector (see Appendix A on page 21) is first sent

with the ‘dddddddd’ in the vector replaced with the block number to be read from flash.

The programmer sends the VERIFY-SETUP vector-set and then waits and polls. Each Read Block operation reads a 64-byte

block from Flash and stores the data in the target’s SRAM. The programmer must then use the READ-BYTE vector (see

Figure 3-11) to individually read each byte in the block. After the programmer reads the block, the programming software must

compare it with the block written to the flash. Data mismatch denotes an incorrect flash write; the programmer must terminate

the programming flow as a failure.

Figure 3-11. READ-BYTE From Target for Verify operation

D0 1

SCLK

SDATA

ZD7D6

D0 Z 1

SCLK

SDATA

Programmer Drives SDATA

Target Drives SDATA

A5 A0A4

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

Comments to this Manuals

No comments

Cypress Semiconductor Perform CY8C24x94 User Manual Page 14

Comments to this Manuals

Related products and manuals for Battery chargers Cypress Semiconductor Perform CY8C24x94