PCF5083HSLASHF2 datasheet(39/136 Pages) PHILIPS

39 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

8.5.2

IOM®-2 MASTER UNIT

The IOM®-2 master unit implements two monitor channels

and C/I channel masters. All handshake protocols are

implemented in accordance with the IOM®-2 standard with

the exception of the constraints mentioned below. The

data structure of a 16-bit monitor and C/I timeslot is also

implemented according to the IOM®-2 standard with the

exception that the timeslot location is not fixed within a

IOM®-2 frame.

As data is structured in 16-bit timeslots (see Table 24) the

timeslot a master works on, can be selected with the flags

IOMCON_REG[MASTERx_TS0 to MASTERx_TS3].

These bits binary encode the timeslot number (0 to 5), with

timeslot 0 being indicated with the rising edge of FSC.

Both monitor masters can be independently enabled with

the flags IOMCON_REG[MASTERx_EN].

For every serviced channel a data register (MON0_REG,

MON1_REG, CI0_REG and CI1_REG) with input and

output buffer stage and a state machine for receive and

transmit direction exists. For every register

IOMFLAG_REG holds two flags to indicate the input data

buffer full and the output buffer empty condition. The flags

are xxx_IBF (input buffer full) and xxx_OBE (output buffer

empty) with xxx equal to the register name. If one of these

flags together with the corresponding enable flag in

IOMEN_REG is set the IOM®-2 interrupt is activated (refer

to Section 10.2). The flags are reset with read respectively

write operations to their corresponding data register.

8.5.3

MONITOR CHANNEL TRANSMITTER PROTOCOL

• After IOMCON_REG[MASTERx_EN] is set to a logic 1,

the transmitter state machine is in an idle state. The

pattern FFH is sent and the output buffer empty flag

MONx_OBE (x = 1 or 2) is set. The MX flag is sent as a

logic 1 in accordance with the IOM®-2 specifications.

• To initiate a message transmission the System

Controller has to program MONx_REG with the first byte

of the message. The MONx_OBE flag is cleared with the

data write access.

• A full handshake is implemented in accordance with the

IOM®-2 specifications. The transmitter may delay the

data transmission in case the System Controller does

not provide new data in time. MX = 0 is maintained until

MONx_REG is programmed with new data. The

MONx_OBE flag is cleared with the data write access.

The receiver delays the data transmission if it sends no

data acknowledge. In this case MX = 0 is maintained

and the data byte is repeated in subsequent frames.

• To request new data from the controller the MONx_OBE

flag may be set as soon as the data acknowledge

(MR = 1) from the receiver is detected except for the first

byte reception. Here the MR transition HIGH-to-LOW

has to be detected. This leaves the controller

approximately 250

µs to program the MONx_REG with

the next byte without delay within the handshake

procedure except for the first byte.

• An end of transmission is sent if the TEOMx flag in

IOMCTRL_REG is set when MONx_OBE = 1 after the

last byte transmission. The end of transmission is sent

(MX = 1 in at least two subsequent frames) after the

acknowledge of the last byte is completely received.

After the end of transmission is sent the transmitter state

machine is in the idle state.

• The TEOMx flags are also used to initialize the

transmitter state machine. If the flag is set the state

machine may get from any state into the idle state.

• The TEOMx flag is automatically cleared.

• If an abort request is received, the transmitter in

accordance with the specifications, sends the end of

transmission sequence and enters the idle state. The

MONx_OBE flag is set. The abort request is indicated

with the RABORTx flag set in IOMCTRL_REG.

RABORTx = 1 also asserts the IOM®-2 interrupt

(MONx_OBE_EN is used as enable bit) to indicate the

abort to the System Controller. The flag is reset with the

MONx_OBE flag.

Table 24 Data structure of a 16-bit IOM®-2 monitor and C/I master timeslot

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MONX

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