38K2 datasheet(91/358 Pages) RENESAS

91 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 72 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

EXB Block Diagram

The block diagram of external bus interface (EXB) is shown below.

The external bus interface (EXB) consists of:

(1) External I/O interface part

(2) CPU interface part

(3) Internal memory interface part

(4) Transmit/Receive data buffer part

External I/O interface

CPU interface

Index register

External I/O

configuration

EXB interrupt

source enable register

Cch_WR

External MCU bus

Cch_RD

P34/ExCS

CPU channel

TxB_RDY

controller

RxB_RDY

P37/ExA0

P36/ExRD

Memory channel

control

Memory channel

operation mode register

Memory channel

transmit buffer control

Transmit buffer register

Receive buffer register

Memory channel

controller

End address register

Memory address

counter

Memory channel

status

P35/ExWR

Mch_RD

Mch_WR

Mch_TC

P41/ExDACK/TxD

mRX_enb

P42/ExTC/SCLK

mTX_enb

P43/ExA1/SRDY

Memory address

Request acknowledge

Memory read data

Memory write data

P33/ExINT

Mch_req

P40/ExDREQ/RxD

FIFO_stt

MRDsel

stt_sel

Buf_WR

Transmit/Receive data

buffer

ExOE

P10/DQ0/AN0–

P17/DQ7/AN7

Decoder data selector

Configuration

signal

Internal memory

interface

: Functions as normal ports just after reset.

Fig. 106 Block diagram of external bus interface (EXB)

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