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TNETA1585PCM Datasheet(PDF) 7 Page - Texas Instruments
TI1 [Texas Instruments]
TNETA1585PCM Datasheet(HTML) 7 Page - Texas Instruments
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ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE
WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES
SDNS041A – NOVEMBER 1996 – REVISED JULY 1998
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
The TNETA1585 device contains the following interfaces:
The traffic-coprocessor interface (COPI) provides the means of communication between the TNETA1585 and
the master device. It consists of the slave interface and the coprocessor interface.
The slave-control (SC) interface consists of a 32-bit data bus, a 6-bit address bus, an output-enable terminal
(SCOE), a write-enable terminal (SCWE), and a select terminal (SCSEL). When used with the TNETA1575 SAR
device, the TNETA1585 slave-control interface is mapped into the SAR’s control-memory space starting at
address 10000h and extending to address 1FFFFh. This equates to a total address space of 64K 32-bit words
with 64 locations applicable to the TNETA1585. The TNETA1575 uses its select terminal to choose between
its control memory and the TNETA1585. The TNETA1585 is a slave to all to-and-from transfers. These are
initiated by the master device that is a SAR or switch port controller.
Table 1 lists the slave registers that are directly accessible through the slave interface. A heading specifies the
slave-interface addresses as control-memory addresses because of the TNETA1575 mapping of the
TNETA1585. Each register is either host associated or SAR associated.
The host accesses the host-associated registers through the SAR and are used by the host to initialize the
TNETA1585 and to configure the TNETA1585’s other internal-data structures and associated parameter
memory. The host has access to the TNETA1585’s other internal-data structures and associated parameter
memory through the host-associated read address, read data, write address, and write data registers as
described in the
TNETA1585 Programmer’s Reference Guide, literature number SDNU016.
The SAR-associated registers are used by the SAR to obtain information related to the scheduling of cells. The
next-cell register indicates when one of the TNETA1585 scheduled connections is ready to transmit and what
type of cell to transmit. It also provides information on how to build the associated cell’s header. In addition, if
the SAR is instructed by the TNETA1585 to transmit an RM cell for ABR connections, the SAR obtains the
properly formatted RM-cell payload from one of the RM-cell-contents FIFOs of the TNETA1585.
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