DS21FF42 Maxim Integrated Products, DS21FF42 Datasheet - Page 63
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DS21FF42
Manufacturer Part Number
DS21FF42
Description
IC FRAMER T1 4X4 16CH 300-BGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS21FT42.pdf
(114 pages)
Specifications of DS21FF42
Controller Type
T1 Framer
Interface
Parallel/Serial
Voltage - Supply
2.97 V ~ 3.63 V
Current - Supply
300mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
300-BGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS21FF42
Manufacturer:
LATTRON
Quantity:
9 020
tied to the TSSYNC input. On power–up after the RSYSCLK and TSYSCLK signals have locked to the
RCLK signal, the elastic stores should be reset.
17.
The DS21Q42 has an enhanced HDLC controller configurable for use with the Facilities Data Link or
DS0s. There are 64-byte buffers in both the transmit and receive paths. The user can select any DS0 or
multiple DS0s as well as any specific bits within the DS0(s) to pass through the HDLC controller. See
Figure 24-15 for details on formatting the transmit side. Note that TBOC.6 = 1 and TDC1.7 = 1 cannot
exist without corrupting the data in the FDL. For use with the FDL, see section 19.1. See Table 18-1 for
configuring the transmit HDLC controller.
Four new registers were added for the enhanced functionality of the HDLC controller; RDC1, RDC2,
TDC1, and TDC2. Note that the BOC controller is functional when the HDLC controller is used for
DS0s. Section 19 contains all of the HDLC and BOC registers and information on FDL/Fs Extraction
and Insertion with and without the HDLC controller.
TRANSMIT HDLC CONFIGURATION Table 17-1
18.1 HDLC FOR DS0S
When using the HDLC controllers for DS0s, the same registers shown in section 19 will be used except
for the TBOC and RBOC registers and bits HCR.7, HSR.7, and HIMR.7. As a basic guideline for
interpreting and sending HDLC messages and BOC messages, the following sequences can be applied.
RECEIVE A HDLC MESSAGE
1. Enable RPS interrupts
2. Wait for interrupt to occur
3. Disable RPS interrupt and enable either RPE, RNE, or RHALF interrupt
4. Read RHIR to obtain REMPTY status
5. Repeat step 4
6. Wait for interrupt, skip to step 4
7. If POK=0, then discard whole packet, if POK=1, accept the packet
8. Disable RPE, RNE, or RHALF interrupt, enable RPS interrupt and return to step 1
DS0(s)
FDL
Disable
A. If REMPTY=0, then record OBYTE, CBYTE, and POK bits and then read the FIFO
B. If REMPTY=1, then skip to step 6
A1. If CBYTE=0 then skip to step 5
A2. If CBYTE=1 then skip to step 7
HDLC CONTROLLER
Function
TBOC.6
0
1
0
63 of 114
TDC1.7
1
0
0
TCR1.2
1 or 0
1 or 0
1