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The SP0256 Speech Board Interface
William Henderson April 17, 2005
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Interface Details
This documents the interface between the SP0256 Speech Board and the TINI TutorIO microprocessor board. The TutorIO board PIA connector is a 26-way IDC socket known as CONN3. This carries the signals of the three 8-bit Ports A, B and C, ground and Vcc (5V). Only Port A is employed by the Speech Board; Ports B and C remain unused. Power to drive the Speech Board is also obtained from the TINI board via the CONN3 interface. The command interface with the SP0256 Speech Board comprises 6 address lines (A1...A6) and the ALD (Address LoaD) and LRQ (Load ReQuest) signals, 8 bits in total. The interface is illustrated in Figure 1
TINI PIA - Port A
IDC Pin Number 1 2 10 9 6 4 3 5 7 8
Speech Board SP0256-AL2
A1 A2 A3 A4 A5 A6 A7 A8 ALD LRQ Speaker Output
CONN3
GND Vcc
A7 A6 A5 A4 A3 A2 A1 A0
V+
G
Figure 1: SP0256 Interface
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The AL2 varant of the SP0256 used here possesses 8 address lines, A1..A8. However, only A1..A6 are employed to select one of 64 phonemes. The address lines A7 and A8 are tied to Ground on the Speech Board. Port A should be configured for output on bits A0..A6 and for Input on A7.
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Speech Commands
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The SP0256 employes the control signals ALD and LRQ to latch addresses and start processing, as follows: The ALD strobe is a short positive pulse and the LRQ indicates the state of the SP0256 Input buffer: * ALD: - 0: Load a new address into the Input Buffer - 1: Latch a new address into the Input Buffer and start outputting the speech patten at that address * LRQ: - 0: The Input Buffer is empty and can accept a new address - 1: The Input Buffer is full and cannot accept a new address A speech command may be issued to the Speech Board as follows: begin( Simple SP0256 command ) { Setup command address on A1..A6; Strobe ALD line; } The ALD strobe should conform to the following bounds: 200ns <= ALD <= 1100ns The above assumes that the SP0256 input buffer is free and the device is able to respond to a new command. It is better to check the status of the command buffer prior to sending a new command; This is performed by synchronising on the LRQ signal, as follows: begin( Synchronous SP0256 command ) { Wait for LRQ == 0; Setup command address on A1..A6; Strobe ALD line; } 2
This protocol is illustrated in Figure 2
SP0256 Now Ready SP0256 Busy SP0256 Now Ready
LRQ A1..A6 ALD
Command Valid
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Strobe Pulse
200ns <= ALD <= 1100ns
Load an Address into Input Buffer
Latch an Address and Start Outputting Speech
Figure 2: SP0256 Command Protocol Consult the Timing Diagram in the SP0256 documentation for detailed AC characteristics of the device.
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Further Information
* Experiments with the SP0256 Speech Synthesiser, http://www.robotprojects.com/voice/SP0256.htm * TutorIOIntroduction.html * Archer Technical Data - SP0256 Speech Processor
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