ADSP-21MOD980N-000 データシートの表示（PDF） - Analog Devices

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ADSP-21MOD980N-000

MultiPort Internet Gateway Processor

Analog Devices 

PRELIMINARY TECHNICAL DATA

ADSP-21mod980N For current information contact Analog Devices at (800) ANALOGD

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

1 1 1 1 1 0 1 1 0 0 0 0 0 0 0 0 DM(0x3FE6)

BMWAIT

CMSSEL

0 = Disable CMS

1 = Enable CMS

PFTYPE

0 = Input

1 = Output

(where bit: 11-IOM, 10-BM, 9-DM, 8-PM)

Figure 7. Programmable Flag1 & Composite Select Control Register

1 Since they are multiplexed within the ADSP-21mod980N, PF[2:0] should be configured as an output for only one processor at a time. Bit [3] of DM

(0x3FE6) must also be 0 to ensure that PF[3] is never an output.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

00000100

00

0 0 0 1 1 1 DM(0x3FFF)

Reserved Set

To 0

SPORT0 Enable

0 = Disable

1 = Enable

RESERVED

SET TO 0

SPORT1 Enable

0 = Disable

1 = Enable

SPORT1 Configure

0 = FI, FO, IRQ0, IRQ1, SCLK

1= SPORT1

P W A IT

Program M emory

Wait States

Disable BMS

0 = Enable BMS

1 = Disable BMS, except when

memory strobes are three-stated

Figure 8. System Control Register

Table 6. ADSP-21mod980N Mode of Operation

MODE C MODE B MODE A Booting Method

1

0

1

IDMA feature is used to load internal memory as desired. Program execution is held off until internal

program memory location 0x0000 is written to. Chip is configured in Slave Mode.1 IACK requires

external pulldown.2

1 Considered standard operating settings. These configurations simplify your design and improve memory management.

2 IDMA timing details and the correct usage of IACK are described in the ADSP-2100 Family User’s Manual.

SLAVE MODE

This section describes the Slave Mode memory configura-

tion of the Modem Processors.

INTERNAL MEMORY DMA PORT (IDMA PORT)

The IDMA Port provides an efficient way for a host system

and the ADSP-21mod980N to communicate. The port is

used to access the on-chip program memory and data mem-

ory of each modem processor with only one processor cycle

per word overhead. The IDMA port cannot be used, how-

12

6/2001 REV. PrB

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