Description
   The IDT77V400 ATM Cell Based Switching Memory provides the logic and memory necessary to perform high-speed buffering and switching operations on ATM cell data. A single IDT77V400 provides a cost effective switching element to implement an 8 x 8 155Mbps switch with 1.2Gbps total switching bandwidth. The user configurable data ports provide an aggregate bandwidth of 1.2Gbps for both receive and transmit functions, and the cell lengths are user programmable to up to 56 bytes.

FEATUREs List
✦ Single chip supports an 8 x 8 port switch at 155Mbps per
   port
✦ Central Memory Architecture eliminates Head-of-Line
   Blocking by sharing the memory array with all ports
✦ Low power dissipation
   – 330mW (typ.)
✦ Data Path Interface (DPI) provides configurable Input and
   Output ports; up to 8 receive and 8 transmit ports at
   155Mbps
✦ Supports data rates up to 1.2Gbps with a 32-bit wide port
   configuration; 155Mbps per 4-bit port
✦ Can be cascaded for larger switch configurations
✦ Fast Input/Output port cycle times
✦ Expander and Concentrator function is fully supported by
   the Input and Output port configuration options
✦ 8192 cells (52 to 56 bytes each) of on-chip buffer memory
   capacity
✦ Configurable cell lengths of 52, 53, 54, 55, or 56 bytes can
   be independently chosen for Input and Output ports
✦ Byte Addition or Byte Subtraction for x4/x8 to x16/x32
   conversion capability
✦ Internal header Cyclical Redundancy Check (CRC) and
   generation logic on-chip
✦ Header modification, pre-pend, and post-pend operations
   available as well as Multicasting and Broadcasting
   capability
✦ High-bandwidth control port for queue controller system
   block, up to 36 MHz cycle time
✦ Can be used with the companion IDT77V500 Switch
   Controller or custom logic for traffic management
✦ Industrial temperature range (-40°C to +85°C) is available
✦ Single +3.3V ± 300mV power supply
✦ Available in an 208-pin Plastic Quad Flat Pack (PQFP) and
   256-ball BGA