isp1122 NXP Semiconductors, isp1122 Datasheet - Page 21

• Manufacturer Part Number: isp1122
• Description: Isp1122 Universal Serial Bus Stand-alone Hub
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 07002
Product specification
10.2 Hardware connections
10.3 Data transfer
Via the I
(PCF8582 or equivalent). The hardware connections are shown in
The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.
The slave address which ISP1122 uses to access the EEPROM is 1010000B. Page
mode addressing is not supported, so pins A0, A1 and A2 of the EEPROM must be
connected to GND (logic 0).
When the ISP1122 is reset, the I
data from an external EEPROM. If no response is detected, the levels on inputs SDA
and SCL are interpreted as INDV and OPTION to select the operating mode (see
Table
The data in the EEPROM memory are organized as shown in
Table 22: EEPROM organization
[1]
[2]
Address
(Hex)
00
01
02
03
04
05
idth
Fig 5. EEPROM connection diagram.
Vendor ID code in the Device descriptor, see
Product ID code in the Device descriptor, see
4).
2
C-bus interface the ISP1122 can be connected to an external EEPROM
USB HUB
ISP1122
Default value
(Hex)
CC
04
22
11
-
AA
OPTION/SCL
Rev. 03 — 29 March 2000
INDV/SDA
2
C-bus interface tries to read 6 bytes of configuration
Contents
idVendor
idVendor
idProduct
idProduct
configuration bits C7 to C0; see
signature
V DD
I
R P
2
C-bus
Table
Table
V DD
[1]
[1]
[2]
[2]
(lower byte)
(upper byte)
10.
10.
R P
(lower byte)
(upper byte)
SCL
SDA
PCF8582
equivalent
EEPROM
or
Table
USB stand-alone hub
MGR780
Table 23
© Philips Electronics N.V. 2000. All rights reserved.
A0
A1
A2
Figure
ISP1122
22.
5.
21 of 48