Modes of Operation
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 9-5
NOTE
The 24-bit data width is not supported.
The total pin number requires also the addition of the control signals CS,
R/W, ACK, OE, TS (MOST/Graphis and Large Flash mode) and TSIZ (MOST/Graphics mode) where available.
The total supported memory size has been calculated taking into account that when accessing 16/32 bit devices A1 and/or
A0 can NOT be used.
The above options defined as BOOT Option are selectable via the reset configuration word. Other configurations are possible via software
configuration (e.g., 8-bit data and 16-bit address). Figure 9-4 shows the operation of Non-MUXed Read/Write accesses.
TSIZ bits are available in all non-muxed modes. They appear on GPIO_WKUP_7 (TSIZ most significant bit, TSIZ 1) and TEST_SEL_1
(TSIZ least significant bit, TSIZ 2), if the LPTZ bit is set in the GPS Port Configuration Register—MBAR + 0x0B00. Only TSIZEs of 1, 2,
or 4 are supported.
TSIZ[1:2] are driven as follows:
01 = Transaction is 1 byte.
10 = Transaction is 2 bytes.
00 = Transaction is 4 bytes.
Other values are invalid and should not be required by the external peripheral!
Table 9-3 describes the various combinations of TSIZ, address and byte lanes for MOST/Graphis mode.
Table 9-2. Non-Muxed Mode Options
Category Address Size Data Size Pins used Memory size Comments
Small 8 8 16 256 Bytes Legacy Mode
Small 8 16 24 256 Bytes Legacy Mode
Small 16 8 24 64 kBytes Legacy Mode
Small 16 16 32 64 kBytes Legacy Mode (BOOT OPTION)
Medium 24 8 32 16 MBytes Legacy Mode (BOOT OPTION)
MOST/G 24 32 56 16 MBytes MOST Graphics (BOOT OPTION)
Burst support. No PCI or ATA support
Large 26 8 34 64 MBytes Large Flash Mode (BOOT OPTION). Burst
support. No PCI support.
Large 26 16 42 64 MBytes Large Flash Mode (BOOT OPTION) Burst
support. No PCI support
Table 9-3. Non-Muxed Aligned Data Transfers
Transfer Size TSIZ[1:2] Addr[1:0]
Data lanes
AD[31:24] AD[23:16] AD[15:8] AD[7:0]
1 Byte 01 00 Data -- -- --
01 -- Data -- --
10 -- -- Data --
11 -- -- -- Data
2 Bytes 10 00 Data Data -- --
10 -- -- Data Data
4 Bytes 00 00 Data Data Data Data
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