Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 609

— Supports arbitrary mapping of any of 0–63 channels to any of 0–127 TDM time slots in case
of common Rx and Tx mapping
— Two simultaneous 32-channel E1 links at 50-MHz system clock
— Up to 128 DMA channels with linear buffer array
— Independent mapping for receive/transmit
— Supports either transparent or HDLC protocols for each channel
— Interrupt circular buffer with programmable size and overflow identification
— Global loop mode
— Individual channel loop mode through the SI
— Programmable frame length (via SI)
— Serial-multiplexed (full duplex) input/output 2048-, 1544-, or 1536-Kbps PCM highways
— Compatible with T1/DS1 24-channel and CEPT E1 32-channel PCM highway, ISDN basic
rate, ISDN primary rate and user-defined
— Subchanneling on each time slot
— Allows independent transmit and receive routing, frame syncs, and clocking
— Concatenation of any, not necessarily consecutive, time slots to channels independently for
receive/transmit
— Supports H0, H11, and H12 ISDN channels
— Allows dynamic allocation of channels
• Ability to connect the TDM channels independently. Each TDM can be one of the following:
— T1 or CEPT line
— Pulse code modulation highway (PCM)
— Integrated services digital network (ISDN) primary rate
— ISDN basic rate—using an interchip digital link (IDL)
— ISDN basic rate—using a general circuit interface (GCI)
— User-defined interfaces
• Independent Tx and Rx routing paths programmed in the SI RAM
• Independent Tx and Rx frame syncs
• Independent Tx and Rx clocks
• Selection of rising/falling clock edges for the frame sync and data bits
• Supports 1× and 2× input clocks (1 or 2 clocks per data bit)
• Selectable delay (0–3 bits) between frame sync and frame start
• Four programmable strobe outputs and two (1x) clock output pins
• Bit or byte resolution in routing, masking, and strobe selection
• Supports frames up to 8,192 bits long
• Internal routing and strobe selection can be programmed dynamically.
• Supports automatic echo and loopback modes for each TDM channel
Freescale Semiconductor
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Serial Interface
20-3