cx82100 Conexant Systems, Inc., cx82100 Datasheet - Page 49

• Manufacturer Part Number: cx82100
• Description: Home Network Processor Hnp
• Manufacturer: Conexant Systems, Inc.

2.3
Optional GPIO and host signal usage is listed in Table 2-9.
Recommended GPIO signals are described in Table 2-10.
Table 2-9. CX82100 HNP Recommended GPIO and Host Signal Use
101306C
FCLKIO/GPIO39
BCLKIO/GPIO38
HAD31 (HCS4#)/GPIO37
HC00 (HCS0#)/GPIO32
GPIO31
GPIO27
GPIO26
GPIO25
GPIO24
USB_PWR_DET (GPIO22)
GPIO21
GPIO20
GPIO19
GPIO18
GPIO17
I2C_CLOCK (GPIO16)
I2C_DATA (GPIO15)
BOPT (GPIO14)
GPIO8
GPIO7
GPIO6
GPIO5
Notes:
1.
2.
3.
4.
5.
6.
Refer to applicable reference design information for exact GPIO use.
Recommended system use. See Table 2-2 for signal definition.
Recommended application use. See Table 2-4 for signal definition.
The Reset State column indicates the state of the pin upon power-on and whether or not it has an internal pullup. Z means a
high impedance state (an input) and pu/pd means the pin has an internal pullup/pulldown.
GPIOs that default to chip selects (GPIO32 and GPIO37), as well as GPIO8 and GPIO17, default to output upon power-on.
GPIO22 is the only GPIO that does not have an internal pullup/down, so if USB detect is important or used, GPIO22 should
be assigned to it. If GPIO22 is not used, or the firmware does not configure it to an output upon initialization, an external
pullup/down must be implemented on the board.
Pin Name
Optional GPIO and Host Signal Usage
Conexant Proprietary and Confidential Information
P14
Pin
M7
C6
G4
A8
A1
C9
C3
B1
B2
A2
A3
E3
E2
K4
D5
E5
D6
E6
J1
J5
J8
CX82100 Home Network Processor Data Sheet
GPIO39
GPIO38
HAD31 (HCS4#)
HC00 (HCS0#)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Default Use
HCS4#:
HCS0#: Flash ROM CE#
USB Power Detect
LAN 1 Reset
Serial EEPROM Shift Clock
Serial EEPROM Data
Boot Loader Option
Ready Indicator
LAN 2 Reset
Recommended Use
USB_PWR_DET
LAN1_RST#
I2C_CLOCK
I2C_DATA
BOPT
LED_READY
LAN2_RST#
Signal Label
Z(pu)
Z(pu)
High
High
Z(pu)
Z(pu)
Z(pu)
Z(pu)
Z(pu)
Z
Z(pu)
Z(pu)
Z(pu)
Z(pu)
Low
Z(pu)
Z(pu)
Z(pu)
Low
Z(pu)
Z(pu)
Z(pu)
Reset
State
5
2, 5
3
3
3
3
3
2, 6
3
3
3
3
3, 5
2
2
2
3, 5
3
3
3
Notes
2-19