NXP Semiconductors MPC5644A, Reference Manual, Page: 296 / 1735

External Bus Interface (EBI)
MPC5644A Microcontroller Reference Manual, Rev. 6
296 Freescale Semiconductor
Figure 14-7. Bank Base Address & Match Structure
When a match is found on one of the chip-select banks, all its attributes (from the appropriate Base and
Option Registers) are selected for the functional operation of the external memory access, such as:
• Number of wait states for a single memory access, and for any beat in a burst access
• Burst enable
• Port size for the external accessed device
See Section 14.4.1.4, EBI Base Registers (EBI_BR0-EBI_BR3, EBI_CAL_BR0-3) and Section 14.4.1.5,
EBI Option Registers (EBI_OR0-EBI_OR3, EBI_CAL_OR0-3) for a full description of all chip-select
attributes.
When no match is found on any of the chip-select banks, the default transfer attributes shown in
Table 14-10 are used.
Table 14-10. Default Attributes for Non-Chip-Select Transfers
CS Attribute Default Value Comment
PS 0 32-bit port size
BL 0 burst length is don’t care since burst is disabled
WEBS 0 write enables
TBDIP 0 don’t care since burst is disabled
BI 1 burst inhibited
SCY 0 don’t care since external TA is used
BSCY 0 don’t care since external TA is used
AD_MUX 0 Address on Data multiplexing
SETA 1 Select external TA to terminate access
A M
[0]
A M
[1]
AM
[2]
AM
[3]
AM
[4]
AM
[5]
[16] [15] [1]
[4]
[3] [2]
BA
[0]
comp comp comp comp comp comp comp
AM[0:16]
A[0:16]
Base Address
Address Mask
Match
BA BA BA BA BA BA
AM
AM
[6]
[16]