DS21458LDK Maxim Integrated, DS21458LDK Datasheet - Page 209
![no-image](/images/no-image-200.jpg)
DS21458LDK
Manufacturer Part Number
DS21458LDK
Description
Network Controller & Processor ICs
Manufacturer
Maxim Integrated
Datasheet
1.DS21458LDK.pdf
(269 pages)
- Current page: 209 of 269
- Download datasheet (2Mb)
32. FRACTIONAL T1/E1 SUPPORT
The DS21455/DS21458 can be programmed to output gapped clocks for selected channels in the receive
and transmit paths to simplify connections into a USART or LAPD controller in fractional T1/E1 or
ISDN-PRI applications. This is accomplished by assigning an alternate function to the RCHCLK and
TCHCLK pins. When the gapped clock feature is enabled, a gated clock is output on the RCHCLK and/or
TCHCLK pins. The channel selection is controlled via the special per-channel control registers. No clock
is generated at the F-bit position. The receive and transmit paths have independent enables. Channel
formats supported include 56kbps and 64kbps.
When 56kbps mode is selected, the clock corresponding to the data/control bit in the channel is omitted.
Only the seven most significant bits of the channel have clocks.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 0/Receive Gapped-Clock Enable (RGPCKEN).
Bit 1/Receive Channel-Data Format (RDATFMT).
Bit 2/Transmit Gapped-Clock Enable (TGPCKEN).
Bit 3/Transmit Channel-Data Format (TDATFMT).
Bit 4/Unused, must be set to zero for proper operation.
Bit 5/Unused, must be set to zero for proper operation.
Bit 6/Unused, must be set to zero for proper operation.
Bit 7/Unused, must be set to zero for proper operation.
0 = RCHCLK functions normally
1 = enable gapped-bit clock output on RCHCLK
0 = 64kbps (data contained in all 8 bits)
1 = 56kbps (data contained in 7 out of the 8 bits)
0 = TCHCLK functions normally
1 = enable gapped-bit clock output on TCHCLK
0 = 64kbps (data contained in all 8 bits)
1 = 56kbps (data contained in 7 out of the 8 bits)
—
7
0
CCR3
Common Control Register 3
72h
—
6
0
—
5
0
—
4
0
209 of 269
TDATFMT
3
0
DS21455/DS21458 Quad T1/E1/J1 Transceivers
TGPCKEN
2
0
RDATFMT
1
0
RGPCKEN
0
0
Related parts for DS21458LDK
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![DS21458+](/photos/6/50/65053/256-csbga_21-0315_tmb.jpg)
Part Number:
Description:
IC LIU QUAD T1/E1/J1 256-CSBGA
Manufacturer:
Maxim Integrated Products
![DS21458](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
Manufacturer:
Maxim Integrated Products
![DS21458-W+](/images/no-image3.png)
Part Number:
Description:
Network Controller & Processor ICs
Manufacturer:
Maxim Integrated
Datasheet:
![DS21](/images/no-image3.png)
Part Number:
Description:
power light source Luxeon Line
Manufacturer:
LUMILEDS [Lumileds Lighting Company]
Datasheet:
![MAX3261CCJ](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX3263CAG](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX7528KCWP](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
MAX7528KCWPMaxim Integrated Products [CMOS Dual 8-Bit Buffered Multiplying DACs]
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX8809AETL+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX1535CETJ+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
![DS2741N+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
![MAX13450EAUD+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
![MAX13451EAUD+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
![MAX17497BATE+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
QFN 16/A°/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
![MAX17502FATB+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products