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14
14.3.2 Operation of RDR (Real-time RAM Content Output)
When the RDR (real-time RAM content output) command is issued, the RTD is made possible to
transfer the contents of the internal RAM to external devices without causing the CPU's internal bus
to stop. Because the RTD reads data from the internal RAM while no transfers are being performed
between the CPU and internal RAM, no extra load is levied on the CPU.
The address to be read from the internal RAM can only be specified on 32-bit word boundaries.
(The two low-order address bits specified by a command are ignored.) Note also that data are read
out in units of 32 bits as transferred from the internal RAM to an external device.
(LSB side)
RTDRXD
Note : X = Don't Care (However, if issued immediately after the RCV command, bits 20-31 must all be set
to 1.)
Figure 14.3.1 RDR Command Data Format
RTDCLK
RTDRXD
RTDTXD
RTDACK
Note : (An) = Specified address
D (An) = Data at specified address (An)
Figure 14.3.2 Operation of the RDR Command
31
20
19 18 17 16
• • • • • •
X
X
0
• • • • • •
Command (RDR)
32 clock
periods
RDR (A1)
• • • • • •
2 clock
periods
REAL-TIME DEBUGGER (RTD)
14.3 Functional Description of the RTD
15
14 13 12
0
1
0
X
X
32 clock
32 clock
periods
periods
RDR (A2)
RDR (A3)
D (A1)
14-5
(MSB side)
• • • • • •
A29
A28
• • • • • •
Specified address
32 clock
periods
• • • • • •
D (A2)
1
0
A17
A16
Ver.0.10
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