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MSM9810

8. Channel Status

The channel status is output from D7-D0.

There are two types of signals to be output as channel status: BUSYn (n = 1-8) signals and NCRn

signals. These two types are selected by the NCR/BUSY pin. When the NCR/BUSY pin is at “H”

level, NCR is output, and when at “L” level, BUSY is output.

The NCR signal is the command and subcommand input status signal (Next Command Request)

of each channel, and the WR signal input is enabled at “H” level.

The BUSY signal outputs “L” level while each channel is executing voice synthesis.

Each channel status signal is output from D7-D0 pins in parallel input interface, and from D5/

S0 pins and D3/SR3-D0/SR0 pins in serial input interface by control of RD. Table 8-1 shows the

relationship between D7-D0 and channels, and Figure 8-1 shows read timing in the parallel input

interface.

Table 8-1 Correspondence between D7-D0 and channels

Data bus

Corresponding channel

D7

D6

D5

D4

D3

D2

D1

D0

CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1

Data out Valid

RD(I)

D7 - D0(I/O)

Figure 8-1 Read timing in parallel input interface

In serial input interface, serial output from D5/SO pins by control of CS and RD, and D3/SR3-

D0/SR0 parallel output (constantly output) can be selected.

For serial output from D5/SO pin, D7-D0, shown in Table 8-1, are output from MSB in serial at

the rise of the SI pin when the RD pin is at “L” level.

Figure 8-2 shows this timing.