TMS320C6720RFP300 datasheet(56/118 Pages) TI

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4.12 Universal Host-Port Interface (UHPI) [C6727B Only]

4.12.1 UHPI Device-Specific Information

UHPI_HDS[2]

UHPI_HDS[1]

UHPI_HCS

UHPI_HRDY

Internal HSTROBE

Internal HRDY

TMS320C6727B, TMS320C6726B, TMS320C6722B, TMS320C6720

Floating-Point Digital Signal Processors

SPRS370E – SEPTEMBER 2006 – REVISED JULY 2008

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The C672x DSP includes a flexible universal host-port interface (UHPI) with more options than the

host-port interface on the C671x DSP.

The UHPI on the C672x DSP supports three major operating modes listed in Table 4-11.

Table 4-11. UHPI Major Modes on C672x

UHPI MAJOR MODE

EXAMPLE FIGURE

Multiplexed Host Address/Data Half-Word (16-Bit) Mode

Figure 4-15

Multiplexed Host Address/Data Fullword (32-Bit) Mode

Figure 4-16

Non-Multiplexed Host Address/Data Fullword (32-Bit) Mode

Figure 4-17

In all modes, the UHPI uses three select inputs (UHPI_HCS, UHPI_HDS[2:1]) which are combined

internally to produce the internal strobe signal HSTROBE. The HSTROBE strobe signal is used in the

UHPI to capture incoming address and control signals on its falling edge and write data on its rising edge.

The UHPI_HCS signal also gates the deassertion of the UHPI_HRDY signal externally.

Figure 4-14. UHPI Strobe and Ready Interaction

The two HPI control pins UHPI_HCNTL[1:0] determine the type of access that the host will perform. Note

that only two of the four access types are supported in Non-Multiplexed Host Address/Data Fullword

Mode.

Table 4-12. HPI Access Types Selected by UHPI_HCNTL[1:0]

NON-

MULTIPLEXED

UHPI_HCNTL[1:0]

DESCRIPTION

MULTIPLEXED

HALF-WORD

FULLWORD

HPI Control Register (HPIC) Access

HPI Data Access (HPID) with autoincrementing address

HPI Address Register (HPIA) Access

HPI Data Access (HPID) without autoincrementing

address

CAUTION

When

performing

set

HPID

with

autoincrementing

address

accesses

(UHPI_HCNTL[1:0] = '01'), the set must begin and end at a word-aligned address. In

addition, all four of the UHPI_HBE[3:0] must be enabled on every access in the set.

CAUTION

The encoding of UHPI_CNTL[1:0] on the C672x DSP is different from HCNTL[1:0] on

the C671x DSP. Modes 01 and 10 are swapped.

Peripheral and Electrical Specifications

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