Technical information

Functional Overview
2.2 CPU
Rev.1.01 2008.05.07 2-3
REJ11J0012-0101
2
2.2 CPU
2.2.1 SH7670 Outline
The SH7670 CPU board contains the 32-bit RISC microcomputer SH7670 that operates with a maximum 200MHz
of CPU clock frequency.
2.2.2 SH7670 Pin Function Used on SH7670 CPU Board
Table 2.2.1~Table 2.2.8 list the SH7670 pin functions used on the SH7670 CPU board.
Table 2.2.1 SH7670 Pin Selection Used on SH7670 CPU Board (1)
Type Pin I/O Name
Function of SH7670 CPU Board
Destination to Connect
Clock EXTAL I External clock Inputs 16.67 MHz from oscillator Connects to oscillator
XTAL O Crystal Crystal resonator is connected
CKIO O System clock Clock output CKIO is branched to connect the
followings
• Connects to SDRAM
• Connects to an extension
connector
Operating
Mode
MD_BW I Mode setting The bus width for CS0 space is set to 16-bit.
MD_BW="L"
Connects to GND
MD_CK1
MD_CK0
I Clock mode
setting
Clock mode is switched.
Clock mode 0 :
MD_CLK0="L",MD_CLK1="L"
Clock mode 1 :
MD_CLK0="H",MD_CLK1="L"
Clock mode 3 :
MD_CLK0="H",MD_CLK1="H"
Switching between MD_CLK0 and MD_CLK1
is executed with the DIP switch SW.
• Connects to DIP switch for
mode setting
MD_CK0, MD_CK1
System
Control
RES# I Power-on
reset
When power-on-reset and pressing the reset
SW, it becomes a power-on-reset state.
Connects to reset circuit
Bus
Control
CS0#
O
Chip select Chip select signal
CS0#
Connects to CE# signal of NOR
flash memory (U3-26)
CS3#
O
Chip select
Chip select signal
CS3#
• Connects to the CS＃ pin of
SDRAM (U4-19,U5-19)
• Connects to an extension
connector (J9-11),
CS4#
O
Chip select
Chip select signal
CS4#(PB06/CS4#)
Connects to an extension
connector (J9-5)
CS5#
O
Chip select
Chip select signal
CS5#(PB05/CS5#/CE1A#/IRQ3/TEND1)
Connects to an extension
connector (J8-11)
CS6#
O
Chip select
Chip select signal
CS6#(PB03/CS6#/CE1B#/IRQ1/DREQ1)
Connects to an extension
connector (J9-7)
CKE
O
CK enable CK enable signal
CKE
• Connects to the CKE＃ pin of
SDRAM (U4-37,U5-37)
• Connects to an extension
connector (J9-14)