TMS320P15 datasheet(98/146 Pages) TI

98 / 146 page

TMS320C17, TMS320E17, TMS320LC17, TMS320P17

DIGITAL SIGNAL PROCESSORS

SPRS009C – JANUARY 1987 – REVISED JULY 1991

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

Table 7. Serial Clock (SCLK) Divide Ratios (X2/CLKIN = 20.48 MHz)

CR27

CR26

CR25

CR24

DIVIDE RATIO

SCLK FREQUENCY

UNIT

0.640

MHz

0.731

MHz

0.853

MHz

1.024

MHz

1.280

MHz

1.463

MHz

1.706

MHz

2.048

MHz

The specification for

µ-law and A-law log PCM coding is part of the CCITT G.711 recommendation. The

following diagram shows a

′C17/E17/P17 interface to two codecs as used for µ-law or A-law companding format.

DX0

DR0

SCLK

DX1

DR1

VSS

VCC

MC/PM

+5 V

PCM In

PCM Out

CLKR/X

FSX

FSR

TCM29C13

PCM In

PCM Out

CLKR/X

FSX

FSR

TCM29C13

Analog Out

Analog In

Analog Out

Analog In

TMS320C17/E17/P17

coprocessor port

The coprocessor port, accessed through I/O port 5 using IN and OUT instructions, provides a direct connection

to most 4/8-bit microcomputers and 16/32-bit micorprocessors. The coprocessor interface allows the

′C17/E17/P17 to act as a peripheral (slave) microcomputer to a microprocessor, or a master to a peripheral

microcomputer such as TMS7042. The coprocessor port is enabled by setting MC/PM and MC low. The

microcomputer mode is enabled by setting these two pins high. (Note that MC/PM

≠ MC is undefined.)

In the microcomputer mode, the 16 data lines are used for the 6 parallel 16-bit I/O ports.

In the coprocessor mode, the 16-bit coprocessor port is reconfigured to operate as a 16-bit latched bus interface.

Control bit 30 (CR30) in control register 1 is used to configure the coprocessor port to either an 8-bit or a 16-bit

length. When CR30 is high, the coprocessor port is 16 bits wide thereby making all 16 bits of the data port

available for 16-bit transfers to 16 and 32-bit microprocessors. When CR30 is low, the port is 8-bits wide and

mapped to the low byte of the data port for interfacing to 8-bit microcomputers. When operating in the 8-bit mode,

both halves of the 16-bit latch can be addressed using the HI/LO pin, thus allowing 16-bit transfers over 8 data

lines. When not in the coprocessor mode, port 5 can be used as a generic I/O port.

TMS320P15 Datasheet(PDF) 98 Page - Texas Instruments

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