vsc055xkm-01 Maxim Integrated Products, Inc., vsc055xkm-01 Datasheet - Page 128

• Manufacturer Part Number: vsc055xkm-01
• Description: Enhanced I?c Backplane Controller
• Manufacturer: Maxim Integrated Products, Inc.

Table 30. I/O Ports
Revision 4.1
January 2008
Pin Name
P0.7
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
P2.1
P2.0
P3.7
P3.6
P3.5
P3.4
P3.3
P3.2
P3.1
P3.0
Pin Number
100
96
97
98
99
86
87
88
89
92
93
94
95
75
76
80
81
82
83
84
85
67
68
69
70
71
72
73
74
1
5
6
Bidirectional
Bidirectional
Bidirectional
Bidirectional
I/O
128 of 133
Description
I/O Port 0, Pulse-Width Outputs
Port 0 is a dedicated 8-bit bidirectional I/O port. The user can select
between an input, totem pole output, or open-drain or open-source
output. Capability to detect input edge changes and select various
output flashing rates is also available.
Through bit control register setup, each odd-numbered bit of this port
can be enabled as an output, which on a pair-by-pair basis, reflects the
current state of each even-numbered bit of this port. Individual control
is provided that allows programming each output as a totem pole or an
open-drain/source driver.
I/O Port 1, Pulse-Width Outputs
Port 1 is a dedicated 8-bit bidirectional I/O port. The user can select
between an input, totem pole output, or open-drain or open-source
output. Capability to detect input edge changes and select various
output flashing rates is also available.
Through control register setup, P1.7-P1.0 can be enabled as pulse-
width modulated outputs, with duty cycles of 0% to 100% in 3%
increments at nominal frequencies of 104 kHz, 52 kHz, and 26 kHz.
Through bit control register setup, each odd-numbered bit of this port
can be enabled as an output, which on a pair-by-pair basis, reflects the
current state of each even-numbered bit of this port. Individual control
is provided that allows programming each output as a totem pole or an
open-drain/source driver.
I/O Port 2, Tach Inputs
Port 2 is an 8-bit bidirectional I/O port. The user can select between an
input, totem pole output, or open-drain or open-source output.
Capability to detect input edge changes and select various output
flashing rates is also available.
Through control register setup, P2.7-P2.0 can be dedicated to
monitoring fans equipped with tachometer outputs.
Through bit control register setup, each odd-numbered bit of this port
can be enabled as an output, which on a pair-by-pair basis, reflects the
current state of each even-numbered bit of this port. Individual control
is provided that allows programming each output as a totem pole or an
open-drain/source driver.
I/O Port 3, Bypass I/Os
Port 3 is a shared 8-bit bidirectional I/O port that can be used as a
general-purpose I/O port or as Port Bypass control. The user can
select between an input, totem pole output, or open-drain or open-
source output. Capability to detect input edge changes and select
various output flashing rates is also available.
Through control register setup, four 2-bit portions of this port can be
dedicated to the control of a combination of PBC/CRU/SDU functions.
Any combination of port bypass control functions can be enabled with
the remaining I/O pins used for general-purpose functions.
Through bit control register setup, each odd-numbered bit of this port
can be enabled as an output, which on a pair-by-pair basis, reflects the
current state of each even-numbered bit of this port. Individual control
is provided that allows programming each output as a totem pole or an
open-drain/source driver.
VSC055-01
Data Sheet