CRU DCS Interface Discussion Communication Flow between DCS
CRU DCS Interface Discussion
Communication Flow between DCS and CRU FE ASIC CRU E Port I 2 C, SPI, JTAG, General Purpose I/O, Interrupts GBT SCA ASIC User Logic (Detector Specific) MINI POD Rx HDLC protocol GBTx E (ISO/IEC 13239: 2002) E Port LINK ASIC TX E LINK @40 MHz DDR = 80 Mbps RX Elink is full duplex , Non deterministic link latency Analog IN x 31 MINI POD Tx Analog Out x 4 PCIe, x 16 Gen 3
E Link Hierarchy
GBTX FEE Boards The GBTSCA include 16 independent I 2 C master serial bus with the following features: 1. Concurrent operation of all 16 channels 2. Individually programmable data transfer rates: 100 KHz, 200 KHz, 400 KHz, 1 MHz Supports both 7‐‐‐‑bit and 10‐‐‐‑bit addressing standards 3. Supports single‐‐‐byte and multibyte I 2 C read/write bus transactions Support read‐ ‐‐‑modify‐‐‐‑write atomic operations with ‘AND’, ‘OR’ or ‘XOR’ masks. The I 2 C channels implements a set of registers Ø to configure the interface and the operating modes, Ø to read the received data and write the bytes to transmit. Specific commands are defined to access those registers. It defines a set of commands to start the I 2 C operations on the bus.
Assumption by ERNO: that VTRx and VTTx and the second GBTx ASIC (the one connected to the uni‐dir VTTX) will be connected to SCA I 2 C master
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