ADSP-21486KSWZ-2AB datasheet(14/71 Pages) AD

14 / 71 page

Rev. H

Page 14 of 71

February 2020

ADSP-21483/ADSP-21486/ADSP-21487/ADSP-21488/ADSP-21489

PIN FUNCTION DESCRIPTIONS

Table 11. Pin Descriptions

Name

Type

State

During/

After Reset

Description

ADDR23–0

I/O/T (ipu)

High-Z/

driven low

(boot)

External Address. The processor outputs addresses for external memory and periph-

erals on these pins. The ADDR pins can be multiplexed to support the external memory

interface address, and FLAGS15–8 (I/O) and PWM (O). After reset, all ADDR pins are in

external memory interface mode and FLAG(0–3) pins are in FLAGS mode (default).

When configured in the IDP_PDAP_CTL register, IDP channel 0 scans the ADDR23–4 pins

for parallel input data.

DATA15–0

I/O/T (ipu)

High-Z

External Data. The data pins can be multiplexed to support the external memory

interface data (I/O), and FLAGS7–0 (I/O).

AMI_ACK

I (ipu)

Memory Acknowledge. External devices can deassert AMI_ACK (low) to add wait

states to an external memory access. AMI_ACK is used by I/O devices, memory

controllers, or other peripherals to hold off completion of an external memory access.

MS0–1

O/T (ipu)

High-Z

Memory Select Lines 0–1. These lines are asserted (low) as chip selects for the corre-

sponding banks of external memory. The MS1-0 lines are decoded memory address lines

that change at the same time as the other address lines. When no external memory

access is occurring the MS1-0 lines are inactive; they are active however when a condi-

tional memory access instruction is executed, when the condition evaluates as true.

The MS1 pin can be used in EPORT/FLASH boot mode. For more information, see the

hardware reference manual.

AMI_RD

O/T (ipu)

High-Z

AMI Port Read Enable. AMI_RD is asserted whenever the processor reads a word from

external memory.

AMI_WR

O/T (ipu)

High-Z

AMI Port Write Enable. AMI_WR is asserted when the processor writes a word to

external memory.

FLAG0/IRQ0

I/O (ipu)

FLAG[0]

INPUT

FLAG0/Interrupt Request0.

FLAG1/IRQ1

I/O (ipu)

FLAG[1]

INPUT

FLAG1/Interrupt Request1.

FLAG2/IRQ2/MS2

I/O (ipu)

FLAG[2]

INPUT

FLAG2/Interrupt Request2/Memory Select2.

FLAG3/TMREXP/MS3

I/O (ipu)

FLAG[3]

INPUT

FLAG3/Timer Expired/Memory Select3.

The following symbols appear in the Type column of this table: A = asynchronous, I = input, O = output, S = synchronous, A/D = active drive,

O/D = open drain, and T = three-state, ipd = internal pull-down resistor, ipu = internal pull-up resistor.

The internal pull-up (ipu) and internal pull-down (ipd) resistors are designed to hold the internal path from the pins at the expected logic

levels. To pull-up or pull-down the external pads to the expected logic levels, use external resistors. Internal pull-up/pull-down resistors cannot

be enabled/disabled and the value of these resistors cannot be programmed. The range of an ipu resistor can be between 26 kΩ–63 kΩ. The

range of an ipd resistor can be between 31 kΩ–85 kΩ. The three-state voltage of ipu pads will not reach to the full VDD_EXT level; at typical

conditions the voltage is in the range of 2.3 V to 2.7 V.

In this table, all pins are LVTTL compliant with the exception of the thermal diode pins.

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