MA28140 datasheet(34/72 Pages) DYNEX

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MA28140

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When CPDUS is asserted, the pointer for reading out data

with FAR1S is reset to the first octet of the FAR. The samples

CPDUS and FAR1S should be activated as described in

Figure 16 to fetch the 128 bits of status words. The first 16 bits

are those of the CPDU status word, to be acquired by asserting

the CPDUS signal line. The next 32 bits are those of the FAR

status word, to be acquired by signalling on the FAR1S signal

line (2 x 16 bits). The last 80 bits are those of the AU status

word, to be acquired by additional assertions (5 x 16 bits) of the

FAR1S signal line. It is possible to read out only the first 48 bits

(CPDU and FAR), e.g. if the AU is not used.

FAR1S, AU1S and AU2S do not have any impact in this

mode, but should be connected to VDD.

octet (all bits set to 0) on the 8 LSB. For example, if the TC

segment to be output is (hexadecimal) AABBCC, the first word

read is AABB and the second one is CC00.

After a PCSN assertion, the PRDY output is activated

when the data is available on the PBUS output. The PRDY is

released when the PCSN signal is deasserted. The PRDY

signal will not be asserted if PCSN is asserted and PAD = 000

(MAP segment read) when MAPDSR is inactive. When PCSN

is deasserted the PBUS bus is tristated. The MAP status word

can be read at any time. The access to this word is identical to

the telemetry status word accesses as described in Figure 18.

It contains the following information:

• PBUS<0>: MAPDSR information (identical to MAP data

set ready signal line).

• PBUS<1>: ODD/EVEN segment length information

(Odd: 1, Even: 0).

• PBUS<15..2>: not used (value : 00000000000000).

NOTE: only TC segments appearing on MAP 1 to 62 and

on MAP 63 when AU is disabled, can be read out using this

parallel interface. MAP 0 is not affected by this parallel

interface since it is directly connected to the CPDU. The

telemetry status word is read as described in Figure 18.

The CLCW status word is read using one read cycle where

PAD = 010.

The CPDU status word is read using one read cycle where

PAD = 001.

The FAR status words are read with two read cycles:

• One read cycle with PAD = 100 for the first 16 bits

(FAR1)

• One read cycle with PAD = 101 for the last 16 bits

(FAR2).

The AU status words are read using five read cycles:

• One read cycle with PAD = 110 for the first 16 bits (AU1)

• Four read cycles with PAD = 111 for the last 64 bits

(AU2): bits 16-31, bits 32-47, bits 48-63 and bits

64-79.

When the AU1 Status report is read, the pointer for reading

out data with AU2 is reset to the second octet of the AU report.

The Status of Survey bit is set when FAR2 is read. The

following pins have no influence in parallel mode:

• MAPDTR (should be connected to VSS),

• CLCWSA, CLCWCA (should be connected to VDD),

• AU2S (should be connected to VDD),

• TMC (should be connected to VDD),

• TMMOD (should be connected to VSS),

The reports and TC segments cannot be read out in an

arbitrary order. The following constraints apply: A FAR2 read

out shall not be separated from the previous FAR1 read out by

AU1 or AU2 read out. An AU2 read out shall not be separated

from a previous AU1 or a previous AU2 read out by FAR1 or

FAR2 read out.

5.4 PARALLEL INTERFACE

A parallel interface is provided on the PTD to access the

TC segment and the four reporting words: CLCW, CPDUS,

FAR and AUS. The parallel mode is selected with the PAR

configuration pin of the PTD (the parallel mode is selected

when PAR is set to 1). The parallel interface is implemented

with the following signals:

• PCSN: parallel bus chip select input,

• PAD<2..0>: parallel address bus (input),

• PRDY: data validation output,

• PBUS<15..0>: parallel data bus (output),

• MAPDSR: MAP data set ready output,

• MAPADT: MAP aborted data transfer output.

The PCSN, PAD2, PAD1 and PAD0 signal lines use

respectively the CPDUS, FAR1S, FAR2S and AU1S input pins

of the serial interface. The application acquires the TC

segment and the four reporting words by read cycles. The

addressing of these words is as follows:

When the AU1 status is read, the pointer for reading out

data with AU2S is reset. The MAP TC segment is read as

described in Figure 17.

A TC segment is read by consecutive accesses to <000>.

Data read when MAPDSR is not asserted is not valid. The TC

segment data octet of even rank is output on the 8 MSB of

PBUS (the first octet is 00 and therefore even). The TC

segment data octet of odd rank is output on the 8 LSB of

PBUS. In the case of a TC segment with an odd number of

octets, the last 16 bits word output on PBUS contains the last

TC segment data octet on the 8 MSB and a non significant

PAD2

PAD1

PAD0

read word

MAP segment

CPDU status

CLCW status

MAP status

FAR1 status

FAR2 status

AU1 status

AU2 status

MA28140 Datasheet(PDF) 34 Page - Dynex Semiconductor

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