DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 68

• Manufacturer Part Number: DS3163
• Description: IC TRPL ATM/PACKET PHY 400-PBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS3163

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 400-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.3.3
The fractional overhead pins provide the ability to insert bits in the DS3/E3 payload that are not used for cells or
packets. The source of fractional overhead bits is controlled by an internal register (see FRAC.TCR), specifying
internal generation or external sourcing via the TFOHENIn pin. The allocation of DS3/E3 payload used for cell and
packet data is also programmable or controlled by the TFOHENIn pin. The TSOFIn, TSOFOn, TDENn, RSOFOn
and RDENn pins are used to determine which bit positions are DS3/E3 overhead so that fractional overhead bits
will be inserted only in DS3/E3 payload. The TCLKOn and RCLKOn clocks can be configured for gapped modes
that will toggle for each fractional overhead bit, allowing a simple way of using the overhead bits for messaging.
Figure 8-19
P designates payload bits, F designates fractional overhead, and L designates DS3/E3 overhead, based on TDEN.
Figure 8-19. External (XFRAC) Transmit Fractional Timing
Figure 8-20
Figure 8-20. External (XFRAC) Receive Fractional Timing
Figure 8-21
Figure 8-21. Internal (IFRAC) Transmit Fractional Timing
TFOHENO
RFOHENI
RCLKI or
TCLKI or
TFOHENI
TCLKI or
RCLKO
TCLKO
TGCLK
RDEN
TCLKO
TSOFO
RSER
RSOF
TSOFI
TFOH
TFOH
TDEN
Internal (IFRAC) and External (XFRAC) Fractional DS3/E3 Overhead Functional Timing
shows the timing with the external fractional transmit port pins
shows the timing with the external fractional receive port pins
shows the timing with the internal fractional transmit port pins
X
1
1
PY4
PX5
PX5
1
X
2
2
PY5
PX6
PX6
2
X
3
PY6
3
PY3
FX1
3
X
4
4
FY1
PY4
FX2
4
FOH
5
5
PY5
FY2
FX3
5
FOH
6
6
PY6
FY3
6
L1
L1
FOH
7
7
P11
P11
7
L1
X
8
8
P11
P12
P12
8
X
9
9
P12
P13
P13
9
X
10
10
10
P13
P14
P14
L1
X
11
11
11
P14
P11
P15
P15
X
12
12
12
P15
P12
P16
P15
X
13
13
13
P13
P16
F11
X
14
14
14
P14
F11
F12
FOH
15
15
15
P15
F12
F13
FOH
16
16
16
F13
P16
L2
L2
FOH
17
17
17
L2
P21
P21
X
18
18
18
P21
P22
P22
X
19
19
19
P22
P23
P23
X
20
20
20
P23
P24
P24
L2
X
21
21
21
P21
P24
P25
P25
X
22
22
22
P25
P22
P26
P26
X
23
23
23
P26
P23
F21
X
24
24
24
F21
FOH
F22