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Chapter 5
Memory Access Control Function
Preliminary User’s Manual U15839EE1V0UM00
5.2 Page ROM Controller (ROMC)
The page ROM controller (ROMC) is provided for access to ROM (page ROM) with the page access
function.
Comparison of addresses with the immediately preceding bus cycle is carried out and wait control for
normal access (off-page) and page access (on-page) is executed. This controller can handle page
widths from 8 to 128 bytes.
5.2.1 Features
•
Direct connection to 8-bit/16-bit page ROM supported
•
In case of 16-bit bus width: 4/8/16/32/64 word page access supported
•
In case of 8-bit bus width: 8/16/32/64/128 word page access supported
•
Page ROM access a minimum of 2 states.
•
On-page judgment function
•
Addresses to be compared can be changed through setting of the PRC register.
•
Up to 7 states of programmable data waits can be inserted during the on-page cycle through setting
of the PRC register.
•
Up to 7 states of programmable data wait can be inserted during the off-page cycle through setting
of the DWC0 and DWC1 registers.
•
Waits can be controlled with pin input.
Содержание mPD703128
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