GX3146 Datasheet, PDF (6/46 Pages) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

1.2 Ball Descriptions
Table 1-1 shows the descriptions for selected GX3146 balls. For a comprehensive list of
balls from the GX3146 Crosspoint family, please refer to GX3290 (and family) Crosspoint
Ball Guide.
Table 1-1: Ball Descriptions
Ball #
Ball Name
Serial Interface I/O
AN16
AN17
AN18
SCLK
SDIN
SDOUT
AN19
S_CS
Parallel Interface I/O
AL23
P_CS
AL24
P_R/W
AL25
AM27 - AM16
AN35 - AN20
General I/O
P_ADS
P_ADD[11:0]
P_DAT[15:0]
AN15
AM35 - AM28
AR33
AR35
Test Interface
AL17
AL18
AL19
AL20
HOST_S/P
UPDATE_EN
[7:0]
POR_DFT
RESET
TCK
TMS
TDO
TDI
I/O Description
I
Serial Host Interface Clock. If unused, tie to ground.
I
Serial Host Interface Data Input. If unused, tie to ground.
O
Serial Host Interface Data Output. Leave NC if not used.
I
Serial Host Interface Chip Select. Active-LOW. Must be tied LOW when
HOST_S/P is set LOW.
I
Parallel host interface chip select. Active-LOW. Must be tied LOW when
HOST_S/P is set HIGH.
I
Selects between read and write operations on the parallel host interface.
HIGH = Read, LOW = Write. If unused, tie to ground.
I
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.
I
Address bus for the parallel interface. If unused, tie to ground.
I/O
Bi-directional data bus for the parallel interface. If P_CS is HIGH, these pins are
configured as inputs. If unused, tie to ground.
Host Interface Select pin. Selects between serial and parallel host interfaces.
I
Serial host interface is enabled when HIGH, parallel host interface is enabled
when LOW. Must assert RESET after changing this pin.
I
Update Strobes used to update the switch matrix configuration (see
Section 4.5). If unused, weak pull-down to ground.
I
This pin disables the Power On Reset circuitry when HIGH. Weak internal
pull-down. Leave NC if not used.
I
Active-LOW reset for entire chip (see Section 4.11 for timing details). Weak
internal pull-up. Leave NC if not used.
I
JTAG test clock. Weak pull-up if not used.
I
JTAG test mode start. Weak pull-up if not used.
O
JTAG test data out. Leave NC if not used.
I
JTAG test data in. Weak pull-up if not used.
GX3146 146 x 146 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-056075 March 2013
www.semtech.com
6 of 46
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