3

1772E–DRMSD–10-Apr-06

ATSAM9708

3.

Pin Description by Function

Notes:

1. ISA bus group pins are powered by V

2. PC_D pads have 4 mA drive capabilities; other output pads have 16 mA drive capabilities.

PC_RD signal.

4. Pin Names in this document exhibiting an overbar (PC_CS for example) indicates that the signal is active low.

Table 3-1.

Power Group

Name

Pin Count

Type

Function

GND

19

PWR

Power Ground. All GND pins should be returned to digital ground.

VC3

8

PWR

+3.3V.

VCC1

5

PWR

returned to +5V (or 3.3V in case of single 3.3V supply).

VCC2

5

PWR

Memory Pad Power, +3.0V to +5.5V. All V

RAM or DRAM) or 3.3V (for SDRAM or 3.3V ROM).

Table 3-2.

ISA Bus Group

(1)

Name

Pin Count

Type

Function

16

I/O

16-bit data bus to host processor.

Information on these pins is:

- 2 x parallel MIDI (MPU-401 type applications)

- 2 x high-speed burst data transfers to/from external memory

PC_A[2:0]

3

IN

Selects one of 8 internal registers:

0, 1: MPU-401 register processor #1

2, 3: Burst data (16-bit) processor #1

4 - 5: MPU-401 register processor #2

6 - 7: Burst data (16-bit) processor #2

1

IN

Chip select from host, active low.

PC_WR

1

IN

Write from host, active low.

PC_RD

1

IN

Read from host, active low.

PC_READY

1

TSout

Open drain output buffer. Driven low during 16-bit burst mode transfers to

synchronize host to the ATSAM9708 memory.

PC_IO16

1TSout

Open drain output buffer; driven low during 16-bit burst mode transfers.

Indicates to host that a 16-bit I/O is in progress.

PC_IRQ

1

TSout

Tri-state output pin, active high. Can be connected directly to host PC_IRQ line.