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Functional Overview

2.7 Clock Module

Rev.1.00 June 1,2005 2-13

REJ11J0002-0100Z

2.7 Clock Module

The clock module in the M3A-HS60 consists of the following two blocks:

• Output from a oscillator connected to EXTAL of the SH7206

• Ceramic resonator connected to EXTAL and XTAL

The M3A-HS60 has a 16.67MHz oscillator connected. Furthermore, the bus clock output from the SH7206 is connected

to the SDRAM via a damping resistor. To connect an extension board to the extension connector, we recommend

including a clock buffer that contains a PLL to ensure that the board will be supplied with a stable clock signal.

Figure2.7.1 shows a block diagram of clock module.

EXTAL

XTAL

CKIO

SH7206

CSTCE-G16M67(Murata)

CY2305SC-1H(Cypress)

CLK

:Not mounted parts

Clock Buffer

*2:To mount a clock buffer, remove the resistor 14

R14

*1:To mount ceramic resonator, remove the resistor 18

R18

R82

Ceramic

Resonator

EXCLK(Extension connecto

CLKIH(SDRAM upper bytes)

CLKIL(SDRAM lower bytes)

scillator

Not mounted

Figure2.7.1 Block Diagram of Clock Module

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 59 60

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Renesas M3A-HS60 Manual de usuario Pagina 27