HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 54

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

1. Overview
Rev.4.00 Mar. 27, 2008 Page 10 of 882
REJ09B0108-0400
Type
Bus control
Direct
memory
access
controller
(DMAC)
Symbol
CS3 to CS0
CS5, CS4
(SH7145
masked ROM
version and
ROM less
version only)
CS7, CS6
(masked
ROM version
and ROM
less version
only)
RD
WRHH
(SH7145
only)
WRHL
(SH7145
only)
WRH
WRL
WAIT
DREQ0,
DREQ1
DRAK0,
DRAK1
DACK0,
DACK1
I/O
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Output
Output
Name
Chip select
3 to 0
Chip select
5, 4
Chip select
7, 6
Read
Write HH
Write HL
Write
upper half
Write lower
half
Wait
DMA transfer
request
DREQ request
acknowledge
DMA transfer
strobe
Function
Chip select signal for external memory or
devices.
Shows reading from external devices.
Shows writing into the HH 8 bits (bits 31 to
24) of the external data.
Shows writing into the HL 8 bits (bits 23 to
16) of the external data.
Shows writing into the upper 8 bits (bits 15
to 8) of the external data.
Shows writing into the lower 8 bits (bit7 to
bit0) of the external data.
Inserts the wait cycles into the bus cycle
when accessing the external spaces.
DMA request input pins from an external
device.
Outputs an acknowledge signal to the
external device that has input a DMA
transfer request signal.
Outputs a strobe to the I/O of the external
device that has input a DMA transfer
request signal.