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ISP1160

Embedded Universal Serial Bus Host Controller

Philips Electronics 

Philips Semiconductors

ISP1160

Embedded USB Host Controller

16-bit register access cycle

write command

(16 bits)

Fig 6. 16-bit register access cycle.

read/write data

(16 bits)

t

MGT937

Most of the ISP1160’s internal control registers are 16-bit wide. Some of the internal

control registers, however, are 32-bit wide. Figure 7 shows how the ISP1160’s 32-bit

internal control register is accessed. The complete cycle of accessing a 32-bit

register consists of a command phase followed by two data phases. In the two data

phases, the microprocessor first reads or writes the lower 16-bit data, followed by the

upper 16-bit data.

32-bit register access cycle

write command

(16 bits)

read/write data

(lower 16 bits)

Fig 7. 32-bit register access cycle.

read/write data

(upper 16 bits)

t

MGT938

To further describe the complete access cycles of the internal control registers, the

status of some pins of the microprocessor bus interface are shown in Figure 8.

Signals

CS_N

A0

RD _ N ,

WR_N

data bus

Valid status

0

1

RD_N = 1,

WR_N = 0

Command code

Valid status

0

0

RD_N = 0 (read) or

WR_N = 0 (write)

Register data

(lower word)

Fig 8. Accessing HC control registers.

Valid status

0

0

RD_N = 0 (read) or

WR_N = 0 (write)

Register data

(upper word)

004aaa370

8.4 FIFO buffer RAM access by PIO mode

Since the ISP1160’s internal memory is structured as a FIFO buffer RAM, the FIFO

buffer RAM is mapped to dedicated register fields. Therefore, accessing the internal

FIFO buffer RAM is similar to accessing the internal control registers in multiple data

phases.

9397 750 11371

Product data

Rev. 04 — 04 July 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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