TMS320VC5507 datasheet(30/108 Pages) TI1

30 / 108 page

SM320VC5507-EP

SPRS613 – SEPTEMBER 2009

www.ti.com

Table 3-5. External Bus Selection Register Bit Field Description (continued)

BITS

DESCRIPTION

EMIF hold

HOLD = 0:

DSP drives the external memory bus

HOLD = 1:

Request the external memory bus to be placed in high-impedance so that another

device can drive the memory bus

EMIF hold acknowledge

HOLDA = 0:

DSP indicates that a hold request on the external memory bus has occured, the EMIF

completed any pending external bus activity, and placed the external memory bus

signals in high-impedance state (address bus, data bus, CE[3:0], AOE, AWE, ARE,

SDRAS, SDCAS, SDWE, SDA10, CLKMEM). Once this bit is cleared, an external

device can drive the bus.

HOLDA = 1:

No hold acknowledge

SDRAM CKE pin selection bit

CKE SEL = 0:

Use XF for SDRAM CKE signal

CKE SEL = 1:

Use GPIO.4 for SDRAM CKE signal

SDRAM CKE enable bit

CKE EN = 0:

XF or GPIO.4 operates in normal mode

CKE EN = 1:

Based on the CKE SEL bit, either XF or GPIO.4 drives the SDRAM CKE pin

SDRAM self-refresh command

SR CMD = 0:

EMIF will not issue a SDRAM self-refresh command

SR CMD = 1:

EMIF will issue a SDRAM self-refresh command

5-2

Reserved. Must be kept as 0000 during any writes to EBSR.

Parallel port mode. EMIF/HPI/GPIO Mode. Determines the mode of the parallel port.

Parallel Port Mode = 00:

Data EMIF mode. The 16 EMIF data signals and 13 EMIF control signals are routed to

the corresponding external parallel bus data and control signals. The 16 address bus

signals can be used as general-purpose I/O only.

Parallel Port Mode = 01:

Full EMIF mode. The 21 address signals, 16 data signals, and 15 control signals are

routed to the corresponding external parallel bus address, data, and control signals.

Non-multiplexed HPI mode. The HPI is enabled an its 14 address signals, 16 data

1-0

signals, and 7 control signals are routed to the corresponding address, data, control

Parallel Port Mode = 10:

signals of the external parallel bus. Moreover, 8 control signals of the external parallel

bus are used as general-purpose I/O.

Parallel Port Mode = 11:

Multiplexed HPI mode. The HPI is enabled and its 16 data signals and 10 control

signals are routed to the external parallel bus. In addition, 3 control signals of the

external parallel bus are used as general-purpose I/O. The 16 external parallel port

address bus signals are used as general-purpose I/O.

3.6.2

Parallel Port

The parallel port of the 5507 consists of 21 address signals, 16 data signals, and 15 control signals. Its 14

bits for address allow it to access 2M bytes of external memory when using the asynchronous SRAM

interface. On the other hand, the SDRAM interface can access the whole external memory space of 16M

bytes. The parallel bus supports four different modes:

•

Full EMIF mode: the EMIF with its 21 address signals, 16 data signals, and 15 control signals routed

to the corresponding external parallel bus address, data, and control signals.

•

Data EMIF mode: the EMIF with its 16 data signals, and 15 control signals routed to the

corresponding external parallel bus data and control signals. The 16 address bus signals can be used

as general-purpose I/O signals only.

•

Non-multiplexed HPI mode: the HPI is enabled with its 14 address signals, 16 data signals, and 8

control signals routed to the corresponding address, data, and control signals of the external parallel

bus. Moreover, 7 control signals of the external parallel bus are used as general-purpose I/O.

•

Multiplexed HPI mode: the HPI is enabled with its 16 data signals and 10 control signals routed to the

external parallel bus. In addition, 5 control signals of the external parallel bus are used as

general-purpose I/O. The external parallel port’s 16 address signals are used as general-purpose I/O.

Functional Overview

Submit Documentation Feedback

Product Folder Link(s): SM320VC5507-EP

TMS320VC5507 датащи(PDF) 30 Page - Texas Instruments

TMS320VC5507 датащи(HTML) 30 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL