cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 546

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

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Electrical Specifications
6.3.11 Miscellaneous Signals
The “recommended use” for GPIO3 and GPIO4 is DDC
support signals DDC_SCL and DDC_SDA, because these
two GPIOs have a high drive capacity, open-drain output.
They use an “SMB” buffer type. The 32 kHZ clock output is
a mux option on GPIO27 and uses a “Q7” buffer. For a
detailed explanation of buffer types, see Table 2-4 "Buffer
Type Characteristics" on page 28.
Note 1. t
Note 2. GPIO27 configured: AUX_IN and Input Enable = 0; Output Enable and AUX_OUT_2 = 1; Open-drain and
Signal
DDC_SCL (GPIO3)
DDC_SDA (GPIO4)
32KHZ (GPIO27)
t
AUX_OUT_1 = 0.
VAL
VAL
min times with load of: 10 pF cap to ground.
max times with load of: 50 pF cap to ground.
Table 6-19. Miscellaneous Signals Except UART Timing Parameters
Parameter
NA
t
VAL
(Continued)
Min
NA
2
546
In this subsection, unless otherwise noted:
• All timing specifications are specified under the oper-
• Signals are referenced to KHZ32_XCI high-to-low edge.
• Signal parameters are defined in Figure 6-2 "AC Refer-
Max
NA
ating conditions listed in Table 6-3 on page 526 (i.e.,
V
T
ence Timing and Test Definition" on page 530.
15
CORE
CASE
= All).
and V
Units
ns
ns
CORE_VSB
Comment/Condition
See Section 6.3.13 "GPIO Signaling"
on page 548.
Note 1 and Note 2.
= All; V
IO
and V
IO_VSB
= All;
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