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TP3465 数据表(PDF) 9 Page - Texas Instruments

部件名 TP3465
功能描述  TP3465 MICROWIRE(TM) Interface Device (MID)
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TP3465 数据表(HTML) 9 Page - Texas Instruments

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Software Driver Procedures (Continued)
4 Write to SKR to set the div bits to support the fastest SK
clock rate supported by the peripherals Set inten e 1 if
the uwdone status is to set an INTerrupt to the host
processor (available only in the Non-multiplexed bus im-
plementation of TP3465 28-pin package) The ms and
the soi bit are set to 0 upon power up and indicate that
the MID is in MICROWIRE Master mode with SO as an
output pin as normal
SENDING DATA TO PERIPHERALS (Normal Mode)
Assume sending 16-bit data to a MICROWIRE based device
connected to any one of CS0 to CS7
1 Write to CS (Chip Select) register and reset the appropri-
ate bit and thus activate the corresponding CS pin
2 Write LOW byte data to SMB (Second MICROWIRE Byte)
register and then HIGH byte data to FMB (First MICRO-
WIRE Byte) register
3 Read the ST (Status) register and stay in a loop until
uwdone
bit is set
4 Write to CS register and set the bit to deactivate the ap-
propriate chip select pin
SENDING DATA TO PERIPHERALS
(Hardware Assisted Chip Select)
Assuming sending 16-bit data to dev3 connected to CS3
pin
1 Write LOW byte data to address SMB and then HIGH
byte data to FMBD3
2 Read the ST register and stay in a loop until uwdone bit
is set
Communicating with an NSC
TP3071 COMBO II Type Device
The NSC TP3071 COMBO II device has a modified MICRO-
WIRE port It shares a single pin (called COCI) for incoming
and outgoing data The MID’s SO pin may be tied to this pin
as shown in
Figure 3 and the following steps are followed
to Read from and Write to this device Assume that the chip
select for TP3071 is connected to CS1 pin
TP3071 Write Operation
a Initialization states skp1 e 1 mwm1 e 1 and soi e 0
b Data transfer options
i Set cs1 bit to 0 write LOW byte to SMB and HIGH
byte to FMB and then set cs1 bit to 1 after uwdone bit
is set to 1
OR
ii Write LOW byte to SMB and HIGH byte to FMBD1
TP3071 Read Operation
a Initialization states skp1 e 1 mwm1 e 0 and soi e 0
b Data transfer options
i Set cs1 bit to 0 write HIGH byte to FMB wait until
uwdone
bit is set to 1 by hardware Set soi bit to 1
Write dummy LOW byte (eg 00h) to FMB wait until
uwdone
bit is set to 1 by hardware Read STATUS
from FMB address Set soi to 0 and cs1 to 1
OR
ii Write HIGH byte to FMBD1 wait until uwdone bit is set
to 1 by hardware Set soi bit to 1 Write a dummy LOW
byte (eg 00h) to FMBD1 and wait until uwdone bit is
set to 1 by hardware Read STATUS from FMBD1 ad-
dress Set soi bit to 0
Applications
The versatile TP3465 MICROWIRE Interface Device can be
used in a number of applications involving MICROWIRE pe-
ripheral devices that need to be controlled using a standard
microprocessor which only has a parallel bus structure
ISDN TERMINAL ADAPTER
The MID can be used in ISDN terminal adapters (see
Figure
4 ) interfacing to ISDN components such as TP3420 SID as
well as non-ISDN components such as LCD display drivers
(eg COP470) and serial EEPROMs (COP494) In this ap-
plication the MID signals SK SO and SI are bussed to all
peripheral devices.
The device chip selects control lines
a total of 8 in the 28-pin package are individually connected
to each of the devices Status Interrupt from the peripherals
such as SID are connected directly to the main processor
ANALOG OR DIGITAL LINECARDS
The MID can also be used in analog and digital (ISDN and
Non-ISDN) linecard applications (see
Figure 5 ) Up to 8
MICROWIRE peripheral devices (TP3070 COMBO II or
TP3420 SIDs TP3410 UIDs or TP3401 DASLs) can be con-
nected to one MID device The Interrupts from the trans-
ceivers may be wire-ORed and fed into one interrupt line of
the main processor in which case all the devices will need
to be polled after an interrupt The efficient interface be-
tween the MID and microprocessor allows this process to
be accomplished with minimum overhead
In a given application if any of the chip select pins are not
used to perform chip select for peripherals then it may be
used as a general purpose inputoutput pin under software
control
MID SUPPORTING MASTER AND SLAVE
MICROWIRE OPERATION
The MICROWIRE serial data bus is often used as a means
of inter-processor communication The MID may be used
either as the Master of the MICROWIRE clock SK or as a
Slave to the SK clock fed via CKIN pin
Figure 6 shows an
application in which two general microprocessors communi-
cate with each other over the MICROWIRE bus At the
same time other peripherals are also connected to the serial
bus External handshaking between the two processors is
required before the MICROWIRE Byte data transfer is exe-
cuted by the master of the MICROWIRE bus
8


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