ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 31

• Manufacturer Part Number: ISP1130DL
• Description: Universal Serial Bus compound hub with integrated keyboard controller
• Manufacturer: Philips Semiconductors

Table 37: Device Status register: bit description
Table 38: Frame number: bit allocation
Philips Semiconductors
9397 750 06895
Objective specification
Bit
2
1
0
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Symbol
Suspend
ConnectChange
Connect
15
R
R
0
7
0
-
9.3.3 Read Current Frame Number
9.3.4 Read Embedded Port Status
9.3.5 Write Embedded Port Status
Reports the frame number (11 bits) of the last successfully received Start Of Frame
(SOF). It is followed by one or two data reads containing the frame number. Byte 1
contains the least significant bits of the frame number (bits 7 to 0), byte 2 holds the
most significant bits (bits 10 to 8) padded with zeroes (see
Code (Hex) — F5
Transaction — read 1 or 2 bytes.
Returns the Embedded Port Status register contents, see
When the SuspendChange or BusReset bit is logic 1, the corresponding bit in the
Interrupt register is set (see
generated. This command resets the SuspendChange, ConnectChange and
BusReset bits.
Code (Hex) — E0 to E2 (embedded function 1 to 3)
Transaction — read 1 byte.
Changes the Embedded Port Status register. Contents of read-only bits are ignored.
Code (Hex) — E0 to E2 (embedded function 1 to 3)
Transaction — write 1 byte.
14
R
R
0
6
0
-
Description
Upon reading this bit indicates the current ‘suspend’ status: A logic 1 indicates
that no activity occurred on the upstream port for more than 3 ms. Any activity on
the upstream port will reset this bit to logic 0.
Writing a logic 0 into this bit will generate a remote wake-up, if the device is
suspended (Suspend = 1). Otherwise, writing a logic 0 has no effect.
Remark: Writing a logic 1 never has any effect.
A logic 1 signals that the value of the Connect bit has changed. This bit is cleared
when it is read.
Writing a logic 1 causes the device to connect its pull-up resistor to the upstream
port, a logic 0 disconnects the pull-up resistor. Upon reading this bit indicates the
current ‘connect’ status.
13
R
R
0
5
0
-
Rev. 01 — 23 March 2000
…continued
12
R
R
Table 27
0
4
0
-
frame[7:0]
USB compound hub with keyboard controller
and
11
R
R
0
3
0
-
Table
28) and a microcontroller interrupt is
10
R
R
0
2
0
Table 39
Table
© Philips Electronics N.V. 2000. All rights reserved.
frame[10:8]
38).
R
R
9
0
1
0
and
ISP1130
Table
40.
R
R
8
0
0
0
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