TMS320C80GF datasheet(71/171 Pages) TI

71 / 171 page

TMS320C80

DIGITAL SIGNAL PROCESSOR

SPRS023B – JULY 1994 – REVISED OCTOBER 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

PT maximum (PTMAX) register (0x01820008)

The PTMAX register determines the maximum number of cycles after PTMIN has elapsed that a packet transfer

executes before timing out. Figure 55 showns the format of the PTMAX register.

PTMAX

Figure 55. PTMAX Register

fault status (FLTSTS) register (0x0182000C)

The FLTSTS register indicates the cause of a memory access fault. Fault status bits are cleared by writing a

1 to the appropriate bit. Figure 56 shows the format of the fault status (FLTSTS) register.

XPT

PP #

3210

PP#

321

PPx Cache / DEA Fault

PPx Packet-Transfer Fault

XPT

Faulting XPT

MP Packet-Transfer Fault

Figure 56. FLTSTS Register

packet-transfer parameters

The most efficient method for data movement in a TMS320C80 system is through the use of packet transfers

(PTs). Packet transfers allow the TC to move blocks of data autonomously between a specified src and dst

memory region. Requests for the TC to execute a packet transfer may be made by the MP, PPs, VC, or external

devices. A packet-transfer parameter table describing the data packet and how it is to be transferred must be

programmed in on-chip memory before the transfer is requested. The parameter table formats for long-form and

short-form packet transfers are shown in Figure 57.

TMS320C80GF Datasheet(PDF) 71 Page - Texas Instruments