DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 59

• Manufacturer Part Number: DS31256
• Description: IC CTRLR HDLC 256-CHANNEL 256BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS31256

• Controller Type: HDLC Controller
• Interface: Serial
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 500mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 6-6. Receive V.54 State Machine
Sync = 0
Sync = 0 or
4 Second Timer
Has Expired
VTO = 1
Search for
Loop Up
Pattern for
32 VCLKs
Reset 4 second timer;
wait for Loss of Sync or
All 1s (64 in a Row)
or for the 4 second
timer to expire
VRST = 1
VLB = 0
VTO = 0
SLBP = 0
Sync = 1
SLBP = 1
VRST (in RP[n]CR)
59 of 183
SYSCLK
All Ones
SLBP = 1
CLK
Data
VLB = 0
Sync = 1
Search for
Loop Down
Pattern
VLB = 1
Sysclk is used only to time
a 4 second timer. It is run into
a 2E27 counter which provides
a 4.03 second time out with a
33MHz clock and a 5.37 second
time out with a 25MHz clock
wait for Loss of Sync or
All 1s (64 in a Row)
All Ones
V.54 State
Machine
v54sm
Sync = 0
Time Out (VTO)
Loopback (VLB);
both in RP[n]CR
Change of
State in Status
(SLBP); in SV54
Sync = 0