Freescale Semiconductor MPC5200B User Manual
Page 270
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).
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