DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 109

• 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 9-11. Transmit DMA Memory Organization
Pending-Queue Base Address (32)
Pending-Queue Host Write Pointer (16)
Pending-Queue DMA Read Pointer (16)
Pending-Queue End Address (16)
Done-Queue Base Address (32)
Done-Queue DMA Write Pointer (16)
Done-Queue Host Read Pointer (16)
Done-Queue End Address (16)
Descriptor Base Address (32)
Internal Registers
109 of 183
Descriptors of Queued Data Buffers that
Information and Links to Other Packet
Transmit Pending-Queue Descriptors:
Descriptors of Data Buffers that have
Transmit Done-Queue Descriptors:
Contains 32-Bit Addresses to Data
Contains Index Pointers to Packet
Done-Queue Descriptors Allowed
Contains Index Pointers to Packet
Buffers as well as Status/Control
Free-Queue Descriptors Allowed
Transmit Packet Descriptors:
are Ready to be Transmitted
Main Offboard Memory
(32-Bit Address Space)
Free Data Buffer Space
Used Data Buffer Space
Up to 64k quad dwords
Descriptors Allowed
been Transmitted
Up to 64k dwords
Up to 64k dwords
Descriptors