DS26528G Maxim Integrated Products, DS26528G Datasheet - Page 43
DS26528G
Manufacturer Part Number
DS26528G
Description
Network Controller & Processor ICs Octal E1-T1-J1 Singl e-Chip Transceiver (
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26528G.pdf
(276 pages)
Specifications of DS26528G
Product
Framer
Number Of Transceivers
8
Supply Voltage (max)
3.465 V
Supply Voltage (min)
3.135 V
Supply Current (max)
875 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Package / Case
TE-CSBGA
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Figure 8-7. TSSYNCIO (Input Mode) Input in H.100 (CT Bus) Mode
8.8.4 Receive and Transmit Channel Blocking Registers
The Receive Channel Blocking registers (RCBR1:RCBR4) and the Transmit Channel Blocking registers
(TCBR1:TCBR4) control the RCHBLK and TCHBLK pins, respectively. The RCHBLK and TCHBLK pins are user-
programmable outputs that can be forced either high or low during individual channels. These outputs can be used
to block clocks to a USART or LAPD controller in ISDN-PRI applications. When the appropriate bits are set to 1,
the RCHBLK and TCHBLK pins are held high during the entire corresponding channel time. When used with a T1
(1.544MHz) backplane, only
backplane when the elastic store is configured for T1-to-E1 rate conversion. See Section 8.8.1.
8.8.5 Transmit Fractional Support (Gapped Clock Mode)
The DS26528 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. When the
gapped clock feature is enabled, a gated clock is output on the TCHCLK signal. The channel selection is controlled
via the Transmit Gapped-Clock Channel Select registers (TGCCS1:TGCCS4). The transmit path is enabled for
gapped clock mode with the TGCLKEN bit (TESCR.6). Both 56kbps and 64kbps channel formats are supported as
determined by TESCR.7. 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).
8.8.6 Receive Fractional Support (Gapped Clock Mode)
The DS26528 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. When the
gapped clock feature is enabled, a gated clock is output on the RCHCLK signal. The channel selection is controlled
via the Receive Gapped-Clock Channel Select registers (RGCCS1:RGCCS4). The receive path is enabled for
gapped clock mode with the RGCLKEN bit (RESCR.6). Both 56kbps and 64kbps channel formats are supported as
determined by RESCR.7. 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).
TSSYNCIO
TSSYNCIO
TSYSCLK
TSER
1
2
NOTE 1: TSSYNCIO IN NORMAL OPERATION.
NOTE 2: TSSYNCIO WITH H.100EN = 1 and TSSYNCINV = 1.
NOTE 3: t
BIT 8
BC
TCBR1:TCBR2:TCBR3
(BIT CELL TIME) = 122ns (typ). t
t
43 of 276
BC
BIT 1
are used.
BC
3
= 244ns OR 488ns ALSO ACCEPTABLE.
TCBR4
is included to support an E1 (2.048MHz)
BIT 2
DS26528 Octal T1/E1/J1 Transceiver
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