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TMS320C203PZ80 Datasheet(PDF) 7 Page - Texas Instruments |
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TMS320C203PZ80 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 83 page  TMS320C203, TMS320C209, TMS320LC203 DIGITAL SIGNAL PROCESSORS SPRS025B – JUNE 1995 – REVISED AUGUST 1998 7 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 TMS320C209 Terminal Functions TERMINAL TYPE† DESCRIPTION NAME NO. TYPE† DESCRIPTION ADDRESS AND DATA BUSES D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 11 13 14 16 17 18 19 20 23 24 25 26 27 28 30 31 I/O/Z Parallel data bus D15 (MSB) through D0 (LSB). D15–D0 are multiplexed to transfer data between the core CPU and external data/program memory or I/O devices. D15–D0 are placed in the high-impedance state when not outputting or when RS is asserted. They also go into the high-impedance state when OFF is active low. A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 60 59 58 57 55 54 53 52 49 48 46 45 44 43 42 39 O/Z Parallel address bus A15 (MSB) through A0 (LSB). A15–A0 are multiplexed to address external data/program memory or I/O devices. These signals go into the high-impedance state when OFF is active low. MEMORY CONTROL SIGNALS PS 65 O/Z Program-select signal. PS is always high unless low-level asserted for communicating to off-chip program space. PS goes into the high-impedance state when OFF is active low. DS 63 O/Z Data-select signal. DS is always high unless low-level asserted for communicating to off-chip program space. DS goes into the high-impedance state when OFF is active low. IS‡ 64 O/Z I/O-space-select signal. IS is always high unless low-level asserted for communicating to I/O ports. IS goes into the high-impedance state when OFF is active low. READY 7 I Data-ready input. READY indicates that an external device is prepared for the bus transaction to be completed. If READY is low, the TMS320C209 waits one cycle and checks READY again. If READY is not used, it should be pulled high. R/W‡ 66 O/Z Read/write signal. R/W indicates transfer direction when communicating to an external device. R/W is normally in read mode (high), unless low level is asserted for performing a write operation. R/W goes into the high-impedance state when OFF is active low. STRB 67 O/Z Strobe signal. STRB is always high unless asserted low to indicate an external bus cycle. STRB goes into the high-impedance state when OFF is active low. RD 78 O/Z Read-select. RD indicates an active, external read cycle and can connect directly to the output enable (OE) of external devices. RD is active on all external program, data, and I/O reads. RD goes into the high-impedance state when OFF is active low. † I = input, O = output, Z = high impedance, PWR = power, GND = ground ‡ IS, R/W, and the data bus are visible at the pins, while accessing internal I/O-mapped registers (for ’C209 devices only). |
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