Flash Programming; Bit Wide Socket Boot Flash; Figure 5-1 : Boot Flash Command Cycles - Tews Technologies TVME8300 User Manual

5 FLASH Programming

5.1

8 bit Wide Socket Boot FLASH

The TVME8300 provides 1 MByte of 8 bit wide socket Boot FLASH using two 512 K x 8 bit 32-pin
PLCC FLASH devices.
The Boot FLASH address range is 0xFFF0_0000 to 0xFFFF_FFFF.
Boot FLASH Socket XU1 is for the lower 512 Kbyte address range (0xFFF0_0000 to 0xFFF7_FFFF).
Boot FLASH Socket XU2 is for the upper 512 Kbyte address range (0xFFF8_0000 to 0xFFFF_FFFF).
For writes to the Boot FLASH byte (8 bit) transfer sizes must be used.
Writes to the Boot FLASH must be enabled in the Utility Control Register.
The 8 bit wide socket Boot FLASH (Socket XU1) must always be installed and provide the
board initialization code at the system reset vector (0xFFF0_0100).
Command
Cycles
Sequence
Read 1
Reset
1
Auto
4
Select
Write 4
Chip
6
Erase
Sector
6
Erase
TVME8300 User Manual Issue 1.4
1st Cycle 2nd Cycle
Addr Data Addr Data
RA RD
Base+
0xF0
0x000
Base+ Base+
0xAA 0x55
0x555 0x2AA
Base+ Base+
0xAA 0x55
0x555 0x2AA
Base+ Base+
0xAA 0x55
0x555 0x2AA
Base+ Base+
0xAA 0x55
0x555 0x2AA

Figure 5-1 : Boot FLASH Command Cycles

3rd Cycle 4th Cycle
Addr Data Addr Data
Base+
MID
0x000
Base+
0x90
0x555
Base+
DID
0x001
Base+
0xA0 WA WD
0x555
Base+ Base+
0x80 0xAA
0x555 0x555
Base+ Base+
0x80 0xAA
0x555 0x555
5th Cycle 6th Cycle
Addr Data Addr Data
Base+ Base+
0x55 0x10
0x2AA 0x555
Base+
0x55 SAx 0x30
0x2AA
Page 30 of 70