ISP1161A1BMGA STEricsson, ISP1161A1BMGA Datasheet - Page 14

• Manufacturer Part Number: ISP1161A1BMGA
• Manufacturer: STEricsson

Specifications of ISP1161A1BMGA

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

ISP1161A1_5
Product data sheet
8.3.2 Register access phases
Figure 10
ISP1161A1 internal control registers.
The ISP1161A1 register structure is a command-data register pair structure. A complete
register access cycle comprises a command phase followed by a data phase. The
command (also known as the index of a register) points the ISP1161A1 to the next
register to be accessed. A command is 8 bits long. On a microprocessor’s 16-bit data bus,
a command occupies the lower byte, with the upper byte filled with zeros.
Figure 12
microprocessor writes a command code to the command port, and then reads or writes
the data word from or to the data port. Take the example of a microprocessor attempting
to read the ISP1161A1’s ID, which is saved in the HC’s HcChipID register (index 27H,
read only). The 16-bit register access cycle is therefore:
1. Microprocessor writes the command code of 27H (0027H in 16-bit width) to the HC
2. Microprocessor reads the data word of the chip’s ID (6110H for engineering sample;
Fig 10.
Fig 11. Microprocessor access to internal control registers.
command port
version one) from the HC data port.
When A1 = 0, the microprocessor accesses the HC.
When A1 = 1, the microprocessor accesses the DC.
When A0 = 0, the microprocessor accesses the data port.
When A0 = 1, the microprocessor accesses the command port.
Microprocessor access to a HC or a DC via an automux switch.
and
shows a complete 16-bit register access cycle for the ISP1161A1. The
Figure 11
Host or Device
bus I/F
Rev. 05 — 29 September 2009
A0
illustrate how an external microprocessor accesses the
CMD/DATA
SWITCH
μP bus I/F
1
0
A1
command port
data port
AUTOMUX
DC/HC
USB single-chip host and device controller
0
1
Control registers
Device bus I/F
Host bus I/F
. .
.
MGT935
Command register
Commands
ISP1161A1
MGT936
© ST-ERICSSON 2009. All rights reserved.
14 of 137