CS22220 datasheet(10/34 Pages) CIRRUS

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CS22220 Wireless PCMCIA Controller

10 of 34

DS557PP2

Rev. 3.0

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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, this is shared as boot-ROM address bit0. Also

used during reset to latch in the strap value for pccsel, if set to a '1'

implies pccard mode

SMA1

Output

Address bit1. Also, this is shared as boot-ROM address bit1. This pin

should be pull-down.

SMA2

Output

Address bit2. Also, this is shared as boot-ROM address bit2. This pin

should be pull-down.

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 pccard

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.

SMA6

Output

Address bit6. Also shared as boot-ROM address bit6. Also used during

reset to latch in the strap value for freq_sel(0). Freq_sel(2:0) is used to

select the multiplication factor for the internal PLL (000=1x, and 111=8x).

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