Information

FB_CSCRn field descriptions (continued)
Field Description
Specifies whether burst writes are used for memory associated with each FB_CSn.
0 Break data larger than the specified port size into individual, port-sized, non-burst writes. For
example, a longword write to an 8-bit port takes four byte writes.
1 Enables burst write of data larger than the specified port size, including longword writes to 8 and 16-
bit ports, word writes to 8-bit ports, and line writes to 8-, 16-, and 32-bit ports.
2–0
Reserved
This read-only field is reserved and always has the value zero.
29.3.4 Chip select port multiplexing control register (FB_CSPMCR)
The CSPMCR register controls the multiplexing of the FlexBus signals.
NOTE
A bus error occurs when:
• writing a reserved value,
• writing to a reserved bit location in this register, or
• not accessing this register as 32-bit.
Address: FB_CSPMCR is 4000_C000h base + 60h offset = 4000_C060h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
GROUP1 GROUP2 GROUP3 GROUP4 GROUP5
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FB_CSPMCR field descriptions
Field Description
31–28
GROUP1
FlexBus signal group 1 multiplex control
Controls the multiplexing of the FB_ALE, FB_CS1, and FB_TS signals.
0000 FB_ALE
0001 FB_CS1
0010 FB_TS
Else Reserved
27–24
GROUP2
FlexBus signal group 2 multiplex control
Controls the multiplexing of the FB_CS4, FB_TSIZ0, and FB_BE_31_24 signals.
0000 FB_CS4
0001 FB_TSIZ0
0010 FB_BE_31_24
Else Reserved
Table continues on the next page...
Chapter 29 External Bus Interface (FlexBus)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 663