GX3246 datasheet(6/47 Pages) SEMTECH

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GX3246 290 x 146 3.5Gb/s Crosspoint

Final Data Sheet

Rev. 2

GENDOC-056078

March 2013

6 of 47

Proprietary & Confidential

www.semtech.com

1.2 Ball Descriptions

Table 1-1 shows the descriptions for selected GX3246 balls. For a comprehensive list of

balls from the GX3246 Crosspoint family, please refer to GX3290 (and family) Crosspoint

Ball Guide.

Table 1-1: Ball Descriptions

Ball #

Ball Name

I/O

Description

Serial Interface I/O

AN16SCLK

Serial Host Interface Clock. If unused, tie to ground.

AN17

SDIN

Serial Host Interface Data Input. If unused, tie to ground.

AN18

SDOUT

Serial Host Interface Data Output. Leave NC if not used.

AN19

S_CS

Serial Host Interface Chip Select. Active-LOW. Must be tied LOW when

HOST_S/P is set LOW.

Parallel Interface I/O

AL23

P_CS

Parallel host interface chip select. Active-LOW. Must be tied LOW when

HOST_S/P is set HIGH.

AL24

P_R/W

Selects between read and write operations on the parallel host interface.

HIGH = Read, LOW = Write. If unused, tie to ground.

AL25

P_ADS

Address and Data Strobe. Strobe signal for latching the address and data

into the chip. See Section 4.12.1 for timing information. If unused, tie to

ground.

AM27 - AM16

P_ADD[11:0]

Address bus for the parallel interface. If unused, tie to ground.

AN35 - AN20

P_DAT[15:0]

I/O

Bi-directional data bus for the parallel interface. If P_CS is HIGH, these pins

are configured as inputs. Leave NC if parallel interface is not used. If

unused, tie to ground.

General I/O

AN15

HOST_S/P

Host Interface Select pin. Selects between serial and parallel host

interfaces. Serial host interface is enabled when HIGH, parallel host

interface is enabled when LOW. Must assert RESET after changing this pin.

AM35 - AM28

UPDATE_EN

[7:0]

Update Strobes used to update the switch matrix configuration (see

Section 4.5). If unused, weak pull-down to ground.

AR33

POR_DFT

This pin disables the Power On Reset circuitry when HIGH. Weak internal

pull-down. Leave NC if not used.

AR35

RESET

Active-LOW reset for entire chip (see Section 4.11 for timing details). Weak

internal pull-up. Leave NC if not used.

Test Interface

AL17

TCKI

JTAG test clock. Weak pull-up if not used.

AL18

TMS

JTAG test mode start. Weak pull-up if not used.

AL19

TDO

JTAG test data out. Leave NC if not used.

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