Applied Data Systems Bitsy Plus, User Manual, Page: 63 / 68

System Specifications
ADS document # 110114-1001A Page 53
6.2.12 SA-1111 Companion Chip
The SA-1111 is a companion to the StrongARM SA-1110. It provides a number of features that
supplement the core processor. These include a USB Host Controller, PCMCIA/CF control logic
and buffers, interface to an AC'97 codec, DMA controllers and an interrupt controller, among
others.
On the Bitsy, the CompactFlash (CF) port can be used as a digital expansion bus. Signals for
PCMCIA, CF and the expansion bus are broken out into a separate section, below.
Absolute Maximum Ratings
Input voltage, digital I/O pins .................................... 3.8 V
Input voltage, CF port I/O pins.................................. 5.5 V
Symbol Parameter Min Typ. Max Units
V
ddx
SA-1111 I/O voltage 3.3 V
V
ccb
CARDBVcc: CF port voltage
(note 30)
3.3 5.0 5.0 V
Digital Outputs
Vol 0 V
ddx
Voh 1.0 V
ddx
Digital Inputs
Vil Vddx=3.3 V 0.2 V
ddx
Vih Vddx=3.3 V 0.8 V
ddx
SPI Bus (section 4.5.3)
Bit rate 460 1840 kHz
Notes:
30. The CF port voltage is selected programmatically with the SA-1111. The socket is keyed
for 5V-tolerant CF cards.
PCMCIA, CompactFlash Port and Expansion Bus
The CompactFlash bus can be used as a digital expansion port on the Bitsy Plus. The following
are specifications for the CF port used as an expansion bus.
Symbol Parameter Min Typ. Max Units
I 3.3V 3.3 V socket current (Note 31) 2 W
I 5V 5 V socket current (Note 31) 2.5 W
Rp pcmcia
Card detect (1 & 2) and voltage
sense (VS1 & 2) pull-ups (Note 32)
100
k
Ω
Vp pcmcia
Card detect and voltage sense pull-
up voltage (Note 33)
Vddx Vcc Vcc V
Digital Outputs
Vol 0 V
ccb
Voh 1.0 V
ccb
I sink mA
I source 4 mA
Digital Inputs
V
ccb
=3.3 V 0.325 V
ccb
Vil
V
ccb
=5.0 V 0.8 V
V
ccb
=3.3 V 0.475 V
ccb
Vih
V
ccb
=5.0 V 2.4 V