전자부품 데이터시트 검색엔진 |
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HDMP-1012 데이터시트(PDF) 4 Page - Agilent(Hewlett-Packard) |
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HDMP-1012 데이터시트(HTML) 4 Page - Agilent(Hewlett-Packard) |
4 / 42 page 576 For timing diagrams for the standard configurations, see the Appendix section entitled Link Configuration Examples. The HDMP-1012/1014 chipset can support serial transmission rates from 150 MBd to 1.5 GBd for each of these configurations. The chipset requires the user to input the link data rate by asserting DIV1 and DIV0 accordingly. To determine the DIV1/DIV0 setting necessary for each application, refer to the section: Setting the Operating Data Rate Range on the next page. Setting the Operating Data Rate Range The HDMP-1012/1014 chipset can operate from 150 MBaud to 1500 MBaud. It is divided into four operating data ranges with each range selected by setting DIV1 and DIV0 as shown in the tables below. The purpose of following example is to help in understanding and using these tables. This specific example uses the table in figure 3 entitled “Typical 20-bit Mode Data Rates”. It is desired to transmit a 20 bit parallel word operating at 55 MHz (55 MWord/sec). Both the Tx and Rx must be set to a range that this word rate falls in-between. According to table entitled “Typical Operating Rates for 20 Bit Mode” on the next page, a setting of DIV1/DIV0 = logic ‘0/0’ allows a parallel input word rate of 32.9 to 62.5 MHz . This setting easily accommodates the required 55 MHz word rate. The user serial data rate can be calculated as: Serial 20 bit 55 Mw Data Rate = (––––––) (––––––) word sec = 1100 MBits/sec The baud rate includes an additional 4 bits that G-LINK transmits for link control and error detection. The serial baud rate is calculated as: Serial 24 bits 55 Mw Baud Rate = (––––––) (––––––) word sec = 1320 MBaud The 55 MHz example is one in which the parallel word rate provides only one possible DIV1/ DIV0 setting. Some applications may have a parallel word rate that seems to fit two ranges. As an example, a 35 MHz (35 MWord/s) parallel data rate fall within two ranges (DIV0/ DIV1 = 0/0 and DIV0/DIV1 = 0/ 1) in 20 Bit Mode. Per the table, a setting of DIV1/DIV0 = 0/1 gives an upper rate of 53.3 MHz , while a setting of DIV1/DIV0 = 0/0 gives a lower rate of 32.9 MHz. These transition data rates are stated in the tables as typical values and may vary between individual parts. Each transmitter/ receiver has continuous band cover across its entire 150 to 1500 MBaud range and has overlap between ranges. Each transmitter/receiver will permit a 35 MHz parallel data rate, but it is suggested that DIV0 be a jumper that can be set either to logic ‘1’ (ground) or logic ‘0’ (open). This allows the design to accommodate both ranges for maximum flexibility. This technique is recommended whenever operating near the maximum and minimum of two word rate ranges. The above information also applies to the HDMP-1012/ 1014 chipset when operating in 16 bit mode. |
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