Philips LPC213 Series User Manual page 45

Philips Semiconductors
Volume 1
Table 28:
Program Memory Request Type
Sequential access, data in latches
Sequential access, data not in latches
Non-sequential access, data in latches
Non-sequential access, data not in latches Initiate Fetch
[1]
[2]
Table 29:
Data Memory Request Type
Sequential access, data in latches
Sequential access, data not in latches
Non-sequential access, data in latches
Non-sequential access, data not in latches Initiate Fetch
[1]
4.5 MAM configuration
After reset the MAM defaults to the disabled state. Software can turn memory access
acceleration on or off at any time. This allows most of an application to be run at the
highest possible performance, while certain functions can be run at a somewhat slower
but more predictable rate if more precise timing is required.
4.6 Register description
All registers, regardless of size, are on word address boundaries. Details of the registers
appear in the description of each function.
User manual
MAM Responses to program accesses of various types
Instruction prefetch is enabled in modes 1 and 2.
The MAM actually uses latched data if it is available, but mimics the timing of a Flash read operation. This
saves power while resulting in the same execution timing. The MAM can truly be turned off by setting the
fetch timing value in MAMTIM to one clock.
MAM responses to data and DMA accesses of various types
The MAM actually uses latched data if it is available, but mimics the timing of a Flash read operation. This
saves power while resulting in the same execution timing. The MAM can truly be turned off by setting the
fetch timing value in MAMTIM to one clock.
Rev. 01 — 24 June 2005
MAM Mode
0 1
[2]
Initiate Fetch Use Latched
[1]
Data
Initiate Fetch Initiate Fetch
[2]
Initiate Fetch Initiate Fetch
Initiate Fetch
MAM Mode
0 1
[1]
Initiate Fetch Initiate Fetch
Initiate Fetch Initiate Fetch
[1]
Initiate Fetch Initiate Fetch
Initiate Fetch
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
UM10120
Chapter 4: MAM Module
2
Use Latched
[1]
Data
[1] [1]
Initiate Fetch
[1][2]
Use Latched
[1]
Data
[1] [1]
Initiate Fetch
2
[1]
Use Latched
Data
Initiate Fetch
[1]
Use Latched
Data
Initiate Fetch
45