DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 89

• 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 9-2. Receive DMA Memory Organization
Free-Queue Base Address (32)
Free-Queue Large Buffer Host Write Pointer (16)
Free-Queue Large Buffer DMA Read Pointer (16)
Free-Queue Small Buffer Start Address (16)
Free-Queue Small Buffer Host Write Pointer (16)
Free-Queue Small Buffer DMA Read Pointer (16)
Free-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
89 of 183
Contains 32-Bit Addresses for Free Data
Receive Done-Queue Descriptors:
Links to Other Packet Descriptors
Receive Free-Queue Descriptors:
Free-Queue Descriptors Allowed
Up to 64k dwords Done-Queue
Status/Control Information and
Receive Packet Descriptors:
Contains Index Pointers to
Contains 32-Bit Addresses
Used Packet Descriptors
Buffers and their Associated
Main Off-Board Memory
(32-Bit Address Space)
Free Data Buffer Space
Used Data Buffer Space
to Free Buffer as well as
Up to 64k Quad dwords
Free Packet Descriptors
Up to 64k Dual dwords
Descriptors Allowed
Descriptors Allowed