TMS320C6727, TMS320C6726, TMS320C6722

Floating-Point Digital Signal Processors

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SPRS268E –MAY 2005 –REVISED JANUARY 2007

The UHPI has several device-level configuration registers which affect its behavior. Figure 4-18, Figure 4-19, and Figure 4-20show the bit layout of these registers. Table 4-12, Table 4-13, and Table 4-14contain a description of the bits in these registers.

31

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

Reserved

 

 

 

 

7

 

 

 

5

 

4

3

2

1

0

 

 

Reserved

 

 

BYTEAD

FULL

NMUX

PAGEM

ENA

 

 

 

 

 

 

R/W, 0

R/W, 0

R/W, 0

R/W, 0

R/W, 0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

 

 

 

 

Figure 4-18. CFGHPI Register Bit Layout (0x4000 0008)

 

 

 

 

Table 4-12. CFGHPI Register Bit Field Description (0x4000 0008)

 

BIT NO.

NAME

RESET

READ

 

 

DESCRIPTION

 

 

VALUE

WRITE

 

 

 

 

 

 

 

 

 

 

 

 

 

31:5

Reserved

 

N/A

N/A

Reads are indeterminate. Only 0s should be written to these bits.

 

4

BYTEAD

 

0

R/W

UHPI Host Address Type

 

 

 

 

 

 

 

 

0

= Host Address is a word address

 

 

 

 

 

 

 

 

1

= Host Address is a byte address

 

 

 

3

FULL

 

0

R/W

UHPI Multiplexing Mode (when NMUX = 0)

 

 

 

 

 

 

 

0

= Half-Word (16-bit data) Multiplexed Address and Data Mode

 

 

 

 

 

 

1

= Fullword (32-bit data) Multiplexed Address and Data Mode

 

2

NMUX

 

0

R/W

UHPI Non-Multiplexed Mode Enable

 

 

 

 

 

 

 

 

0

= Multiplexed Address and Data Mode

 

 

 

 

 

 

 

1

= Non-Multiplexed Address and Data Mode (utilizes optional UHPI_HA[15:0] pins).

 

 

 

 

 

Host data bus is 32 bits in Non-Multiplexed mode. Setting this bit prevents the EMIF

 

 

 

 

 

from driving data out or 'parking'the shared EM_D[31:16]/UHPI_HA[15:0] pins.

1

PAGEM

 

0

R/W

UHPI Page Mode Enable (Only for Multiplexed Address and Data Mode).

 

 

 

 

 

 

0

= Full 32-bit DSP address specified through host port.

 

 

 

 

 

 

1

= Only lower 16 bits of DSP address are specified through host port. Upper 16 bits

 

 

 

 

 

are restricted to the page selected by CFGHPIAMSB and CFGHPIAUMB registers.

0

ENA

 

0

R/W

UHPI Enable

 

 

 

 

 

 

 

 

 

0

= UHPI is disabled

 

 

 

 

 

 

 

 

 

1

= UHPI is enabled. Set this bit to '1'only after configuring the other bits in this

register.

60

Peripheral and Electrical Specifications

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Texas Instruments TMS320C6727, TMS320C6722 Bytead Full Nmux Pagem ENA, BIT no Name Reset Read Description Value Write