YAMAHA YTD439 Datasheet
YTD439
ISTU
ISDN BRI controller for Terminal Equipment with built-in DSU
❑ Abstract
YTD439 is a LSI that integrates in a single chip all the communication functions that are
necessary for constructing an ISDN terminal with a built-in DSU. The functions of both the DSU
(U reference point) and terminal (S/T reference point) are packed into the 100-pin SQFP chip
allowing miniaturization of the terminal equipment.
YTD439 has a built-in TD switch function that is necessary for controlling the connection of the
B-channel data. By connecting an external CPU, memory, and CODEC, a terminal with a built-in
DSU can be configured. In addition, YTD439 has a function that reduces the power consumption
by stopping the functions of unused blocks. This is effective for battery-driven terminals.
❍ Features
DSU block
• Conforms to TTC Standards JT-I430 and JT-G961.
• LT (line termination) function and CT (circuit termination) function.
• DSU can be disconnected.
S/T reference point driver/receiver block
• Transition to the sleep state possible by setting an I/O register.
CPU interface block
• 8-bit or 16-bit data bus selectable.
• I/O access through registers.
YTD439 CATALOG
CATALOG No.:4TD439A2
2001.1
Layer 1 control block
• Frame assembling and disassembling function.
• I430 TTL output pin
Layer 2 control block
• Built-in LAPD protocol (supports four links).
• Call control and D-channel packet function.
Layer 3 interface block
• Message exchange through I/O access (large 1088-byte FIFO).
B channel HDLC controller
• Supports CRC-CCITT and CRC-32.
• 128k/64k/56k rate adaption
B channel transparent
• Supports PIAFS 64k/32k.
• Flexible rate adaption function.
B channel DATA FIFO
• Transmission and reception: 128-byte FIFO × 2 channels.
TD switch
• Switch circuit for 8 channels of B channel data.
• 512 k to 2,048 kHz PCM highway.
Others
• Terminal block can be disconnected. Power can be cut off.
• Terminal block sleep mode.
• Power supply to the analog block: +5 V.
Power supply to the digital block: +5 V or 3.3 V.
• 5 V tolerant I/O pin
• 100-pin SQFP.
❍ Applications
• Terminal adapter
• Remote router
• ISDN telephone
• ISDN home telephone
• ISDN Facsimile
- 2 -
❍ Functional Comparison of YAMAHA ISDN LSIs
Function YTD428YTD421
DSU Function
Layer 1
Layer 2
ETSI
ETS 300 012, ETS 300 125
North American Switches
National ISDN-1/2, AT&T 5ESS,
Nortel DMS-100
S/T Ref. Point Analog Driver/Receiver
Maximum D
Channel Links
D Channel Layer 3 Data Transfer Method
HDLC Controller for B Channel Data
B Channel Data Transfer Method
B Channel Internal Clock Mode (kHz)
TTC Standard
TTC Standard
Circuit switching
Dch Packet Switching
(Teleaction communication)
JT-I430
JT-Q920
JT-Q921
1993 edition
1997 edition
1993 edition
√√
YTD423 YTD436 YTD439
1997 editionTTC Standard JT-G961
1993 edition 1997 edition 1997 edition
1993 edition
1993 edition
1998 edition
1993 edition
1998 edition
√√
√
External
[YTD421]
2
DMA Transfer
or
I/O Transfer
√√
DMA Transfer
or
I/O Transfer
√
√√
222
2
(2)
DMA Transfer
or
I/O Transfer
External
DMA Transfer
or
I/O Transfer
(Note 1)
32, 56, 6432, 56, 64
I/O Transfer
I/O Transfer
2
(2)
B Channel External Clock Mode
TD Switch
Clock Output Function for CPU
Signal Output Function for Testing
Power Supply (V)
5-V Tolerant I/O pin
Package
Note 1:DMA transfer: Request function only
I/O transfer: 4-byte FIFO
Note 2:Digital power supply only
+5
or
+3.3 (Note 2)
+5 +5
100-pin SQFP 100-pin SQFP 100-pin SQFP100-pin SQFP20-pin SSOP
√√√
√
√√√
√√
√
+5
or
+3.3 (Note 2)
+5
or
+3.3 (Note 2)
√
- 3 -
❑ Block Diagram
❍ User-Network Interface Block Diagram
YTD439 is best-suited for applications in terminal equipment with built-in DSU (TA, TE1)
such as terminal adapters and remote routers with built-in DSUs.
YTD439 contains a DSU function, which is necessary between the ISDN switch and the usernetwork interface, and layer 1 and layer 2 functions, which are required of ISDN system
equipment. By adding minimal peripheral parts such as microprocessor and CODEC, terminal
equipment can be optimally configured.
R
TE2
(Non-ISDN
terminal)
User's premises
TE2
TE1
SU
TE1
(ISDN terminal)
RS
TA
(Terminal adapter)
TE1
NT2
(PBX, etc.)
TE2
TE1
S/T
TA with
built-in DSU
T
(DSU)
S/T
R
S/T
TA with
built-in DSU
ISDN
Network
NT1
YTD439
U
YTD436 or
YTD423 + YTD421
YTD428 (DSU)
- 4 -
❍ Internal Block Diagram
Rate adaption
block
Transparent
PIAFS
FIFO
(1088 byte)
HDLC
controller
64k × 2
16k
B channel
data
FIFO
(128 byte × 2)
Control
I/O register
Layer 1
control
block
Terminal
block
Layer 2 control
block
(LAPD)
Circuit
termination
block
Line
termination
block
U ref.
point I/F
Layer 3 I/F block
T ref.
point
connection
control
block
DSU block
B channel data control block (CH-A)
B channel connection section
TD switch (8ch)
B channel data control block (CH-B)
Internal bus
B channel PCM highway I/F (CODEC, etc)
(512 k to 2,048 kHz )
U ref. point
15.36 MHz
S/T ref.
point
CPU I/F
Programmable I/O
S/T ref.
point
driver/
receiver
block
Clock
generator
D channel
B1/B2
channel
- 5 -
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