Rainbow-electronics W90P710CDG Manual do Utilizador descarregar pdf (Página 20)

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5. PIN DESCRIPTION

Table 5.1 W90P710 Pins Description

PIN NAME IO TYPE DESCRIPTION

Clock & Reset

EXTAL (15M) I 15MHz External Clock / Crystal Input

XTAL (15M) O 15MHz Crystal Output

EXTAL32(32.768

I 32768Hz External Clock / Crystal Input(for RTC)

XTAL32(32.768K) O 32768Hz Crystal Output(for RTC)

nRESET IS System Reset, active-low

JTAG Interface

TCK IDS JTAG Test Clock, internal pull-down with 58K ohm

TMS IUS JTAG Test Mode Select, internal pull-up with 70K ohm

TDI IUS JTAG Test Data in, internal pull-up with 70K ohm

TDO O JTAG Test Data out

nTRST IUS JTAG Reset, active-low, internal pull-up with 70K ohm

External Bus Interface

A [21:18] O Address Bus (MSB) of external memory and IO devices.

A [17:0] IOS Address Bus of external memory and IO devices.

D [31:16] /

VD[23:8] /

GPIO [67:52]

IOU

Data Bus (MSB) of external memory and IO device, internal pull-up with 70K

ohm.

General Programmable In/Out Port GPIO[67:52].

D [15:0] / IOU Data Bus (LSB) of external memory and IO device.

nWBE [3:0] /

SDQM [3:0] /

GPIO[69:68]

IOU

Write Byte Enable for specific device (nECS [3:0]).

Data Bus Mask signal for SDRAM (nSCS [1:0]), active-low.

General Programmable In/Out Port [69:68]

nSCS [1:0] O SDRAM chip select for two external banks, active-low.

nSRAS O Row Address Strobe for SDRAM, active-low.

nSCAS O Column Address Strobe for SDRAM, active-low.

nSWE O SDRAM Write Enable, active-low

MCKE O SDRAM Clock Enable, active-high

MCLK O System Master Clock Out, SDRAM clock, output with slew-rate control

nWAIT /

GPIO[70] /

nIRQ5

IOU

External Wait, active-low.

This pin indicates that the external devices need more active cycle during

access operation.

General Programmable In/Out Port GPIO[70]. If memory and IO devices in EBI

do not need wait request, it can be configured as GPIO[7] or nIRQ5

nBTCS O ROM/Flash Chip Select, active-low.

nECS [3:0] O External I/O Chip Select, active-low.

nOE O ROM/Flash, External Memory Output Enable, active-low.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 551 552

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