32186 datasheet(792/1032 Pages) RENESAS

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REAL TIME DEBUGGER (RTD)

15-6

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

32 clock

periods

32 clock

periods

WRR(A1)

(A1) Write data

3 clock periods

RTDCLK

RTDRXD

RTDTXD

RTDACK

WRR(A2)

(A2) Write data

D (A1) Read value

before writing

D (A1) Verify value

after writing

Notes: • (An) = Specified address

• D(An) = Data at specified address (An)

32 clock

periods

32 clock

periods

Figure 15.4.5 Operation of the WRR Command

15.4.3 Operation of WRR (RAM Content Forcible Rewrite)

When the WRR (RAM content forcible rewrite) command is issued, the RTD forcibly rewrites the contents of

the internal RAM without causing the CPU’s internal bus to stop. Because the RTD writes data to the internal

RAM while there are no transfers performed between the CPU and internal RAM, no extra CPU load is in-

curred.

Only the 32-bit word-aligned addresses(The lower address B’00) can be specified for read from the internal

RAM. (The two low-order address bits specified by a command are ignored.) Data are written to the internal

RAM in 32-bit units.

The external host should transmit the command and address in the first frame and then the write data in the

second frame. The RTD writes to the internal RAM in the third frame after receiving the write data.

Figure 15.4.4 WRR Command Data Format

The RTD reads out data from the specified address before writing to the internal RAM and again reads out

data from the same address immediately after writing to the internal RAM (this helps to verify the data

written to the internal RAM). The read data is output at the timing shown below.

19 18 17 16

A15

A14

14 13 12

A16

A17

A28

A29

Command (WRR)

Specified address

Notes: • X = Don't care. (However, if issued immediately after the RCV command, bits 20-31 must all be set to "1.")

• The specified address and write data are transferred LSB-first.

b31

b30

Write data

RTDRXD

(MSB side)

(LSB side)

RTDRXD

a) First frame

b) Second frame

15.4 Functional Description of RTD

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