ds26518 Maxim Integrated Products, Inc., ds26518 Datasheet - Page 160

• Manufacturer Part Number: ds26518
• Description: 8-port T1/e1/j1 Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 7: Receive Channel Data Format (RDATFMT)
Bit 6: Receive Gapped Clock Enable (RGCLKEN)
Note: RGPCKEN and RDATFMT are not associated with the elastic store and will be explained in the fractional
support section.
Bit 4: Receive Slip Zone Select (RSZS). This bit determines the minimum distance allowed between the elastic
store read and write pointers before forcing a controlled slip. This bit is only applies during T1 to E1 or E1 to T1
conversion applications.
Bit 3: Receive Elastic Store Align (RESALGN). Setting this bit from a zero to a one will force the receive elastic
store’s write/read pointers to a minimum separation of half a frame. No action will be taken if the pointer separation
is already greater or equal to half a frame. If pointer separation is less than half a frame, the command will be
executed and the data will be disrupted. Should be toggled after RSYSCLKn has been applied and is stable. Must
be cleared and set again for a subsequent align.
Bit 2: Receive Elastic Store Reset (RESR). Setting this bit from a zero to a one will force the read pointer into the
same frame that the write pointer is exiting, minimizing the delay through the elastic store. If this command should
place the pointers within the slip zone (see bit 4), then an immediate slip will occur and the pointers will move back
to opposite frames. Should be toggled after RSYSCLKn has been applied and is stable. Do not leave this bit set
HIGH.
Bit 1: Receive Elastic Store Minimum Delay Mode (RESMDM)
Bit 0: Receive Elastic Store Enable (RESE)
0 = 64kbps (data contained in all 8 bits).
1 = 56kbps (data contained in 7 out of the 8 bits).
0 = RCHCLKn functions normally.
1 = Enable gapped bit clock output on RCHCLKn.
0 = Force a slip at 9 bytes or less of separation (used for clustered blank channels).
1 = Force a slip at 2 bytes or less of separation (used for distributed blank channels and minimum delay
mode).
0 = Elastic stores operate at full two-frame depth.
1 = Elastic stores operate at 32-bit depth.
0 = Elastic store is bypassed.
1 = Elastic store is enabled.
RDATFMT
7
0
RGCLKEN
RESCR
Receive Elastic Store Control Register
085h + (200h x (n - 1)) : where n = 1 to 8
6
0
—
5
0
160 of 286
RSZS
4
0
RESALGN
3
0
DS26518 8-Port T1/E1/J1 Transceiver
RESR
2
0
RESMDM
1
0
RESE
0
0