2001 Jun 19

12

Philips Semiconductors

Preliminary specification

Bluetooth Adapter IC

PCF26100

6.4

Serial interface

6.4.1

The 3-wire S-bus at the radio side is a 32-bit serial interface which is used for control, TX/RX and channel information.

The 32-bit definition is given in Tables 4 and 5.

Bits 31 to 9 are static values and will not change dynamically, the value for these bits come from the static registers. Only

the trx and main divider fields will control the UAA3558 on a slot-by-slot basis. The trx and main divider information comes

from the baseband controller serial interface channel word; see Section 6.5.1. However, the baseband controller channel

information needs a conversion to get the correct main divider information for the UAA3558.

Table 4

UAA3558 3-wire programming word

Table 5

UAA3558 3-wire programming word (continued)

6.4.2

JTAG

The JTAG serial interface is used to control the PCF26100 and subsequently the radio. The PCF26100 must be the only

slave on the JTAG bus as the PCF26100 does not allow for multi-slave operation. The JTAG interface protocol used is

fully compliant with the standard set out in

“IEEE Std 1149.1-1990”. The following features are supported:

• 5-bit register address

• 8-bit data

• Set instruction register

• Read/write data register (note: some addresses have a separate read and write data register).

The JTAG interface allows for 2 ways of accessing a register. One is the communicate address and data, and the second

one is for successive accesses to the same registers where only the data is communicated. This can, for example, be

used for updating the channel information before every packet.

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

test

dpo

BW adjust

strc

sdsn

sdco

ssqs

ssth

dmo

tin

15

14

13

12

11

10

9876543210

tsw

tamp

ref1

ref0

txp1

txp0

pll

trx

main divider (n)