CS22210 datasheet(10/31 Pages) CIRRUS

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CS22210 PCI/USB Wireless Controller

10 of 31

D556PP2

Rev. 3.0

www.cirrus.com

nSMWE

Output

Write enable is used in combination with nSMRAS, nSMCAS, and

nSMWE to specify whether the current cycle is a read or a write cycle.

Also used during reset to latch in the strap value for tst_bypass; if set to a

'1' implies PLL bypass.

Also shared as the ROMWE to do flash

programming.

SMDQM[1:0]

Output

Data mask bit 1:0. These signals function as byte enable lines masking

unwanted bytes on memory writes.

Also used as testmode(1:0) when

NTEST pin is '0'.

SMCKE

Output

Clock enable. SMCKE is used to enable and disable clocking of internal

RAM logic.

SMA0

Output

Address bit0. The address bus specifies either the row address or column

address. Also shared as boot-rom address bit0. This pin should be pull-

down.

SMA1

Output

Address bit1. Also shared as boot-rom address bit1. Also used during

reset to latch in the strap value for pcisel; if set to a '1' implies pci mode.

SMA2

Output

Address bit2. Also shared as boot-rom address bit2. Also used during

reset to latch in the strap value for usbsel; if set to a '1' implies usb mode.

SMA3

Output

Address bit3. Also shared as boot-rom address bit3. This pin should be

pull-down.

SMA4

Output

Address bit4. Also shared as boot-rom address bit4.

Also used during

reset to latch in the strap value for romcfg; if set to a '1' implies pci

configuration data should be downloaded from ROM.

SMA5

Output

Address bit5. Also shared as boot-rom address bit5. Also used during

reset to latch in the strap value for test_rst_enb; if set to a '0' implies

normal operation mode.

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