DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 110

• 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 9-12. Transmit DMA Packet Handling
Transmit DMA Configuration RAM
Next Pending Descriptor Pointer
Last Pending Descriptor Pointer
Start Descriptor Pointer
Next Descriptor Pointer
1st Descriptor
(EOF=0/CV=0)
2nd Descriptor
(EOF=0/CV=0)
Last Descriptor
(EOF=1/CV=1)
Last Descriptor
(EOF=1/CV=0)
Packet Chain
Column 1
Buffer 1
Packet 1
Buffer 2
Packet 1
Buffer 3
Packet 1
Buffer 1
Packet 2
1st Descriptor
(EOF=0/CV=0)
2nd Descriptor
(EOF=0/CV=0)
Last Descriptor
(EOF=1/CV=1)
Last Descriptor
(EOF=1/CV=0)
PV=1
Packet Chain
Column 2
Buffer 1
Packet 3
Buffer 2
Packet 3
Buffer 3
Packet 3
Buffer 1
Packet 4
Next Pending
Descriptor Pointer
stored within the
Packet Descriptor
110 of 183
Last Descriptor
(EOF=1/CV=0)
PV=1
Packet Chain
Column 3
Buffer 1
Packet 5
Next Pending
Descriptor Pointer
stored within the
Packet Descriptor
1st Descriptor
(EOF=0/CV=0)
2nd Descriptor
(EOF=0/CV=0)
Last Descriptor
(EOF=1/CV=0)
Packet Chain
Column 4
Buffer 1
Packet 6
Buffer 2
Packet 6
Buffer 3
Packet 6